Once the act's theme starts to be heard from the Yamaha YM-2151 the screen will start its scrolling to the right as four Atmospheric Airships come flying into view from its right side while firing missiles at you; once you've fired enough shots at each of these to kill them, the screen will start scrolling inwards as eight more Atmospheric Airships come flying into view (and emerge from the ocean) from behind you while firing missiles at you. Once you have fired enough shots at both of them to kill them two Mosquitoes will come flying into view from the right and left sides of the screen while firing "energy bombs" at you - and once you've fired enough shots at both of them to kill them, four more Atmospheric Airships will come flying into view (and emerge from the ocean) from behind you, while firing missiles at you. Once you have fired enough shots at each of these to kill them, five more Atmospheric Airships will come flying towards you while firing missiles at you; once you've fired enough shots at each of these to kill them, the screen will scroll to the right again, then start scrolling outwards, as five more Atmospheric Airships come flying into view from behind you while firing missiles at you. Once you fire enough shots at each of these to kill them, a twenty-seventh Atmospheric Airship will emerge from the ocean in front of you, and start firing missiles at you - and once you have fired enough shots at it to kill it, a third Mosquito and a twenty-eighth Atmospheric Airship will come flying into view from that right side of the screen while firing "energy bombs" and missiles at you. Once you have fired off enough shots at both of them to kill them, ten Boater Zaku will come hovering into view from the left and right sides of the screen, while firing shots at you; once you have fired enough shots at both of them to kill them, two more Atmospheric Airships will emerge from the ocean in front of you, and start firing missiles at you. Once you have fired enough shots at both of them to kill them, two more Atmospheric Airships will come flying into view from the right side of the screen, while firing missiles at you - and once you've fired enough shots at both of them to kill them, a thirty-third Atmospheric Airship will emerge from out of the ocean in front of you to start firing missiles at you. Once you have fired enough shots at it to kill it, four more Atmospheric Airships will come flying into view from the left and right sides of the screen while firing missiles at you; once you have fired off enough shots at each of them to kill them eight more Boater Zaku will come hovering into view from the left and right sides of the screen while firing shots at you. Once you have fired enough shots at each of them to kill them, a thirty-eighth Atmospheric Airship and a fourth Mosquito will fly into view on the right and left sides of the screen while firing missiles and "energy bombs" at you - and once you have fired enough shots at both of them to kill them two more Atmospheric Airships will emerge from the ocean in front of you and start firing missiles at you. Once you have fired enough shots at both of these to kill them, a forty-first Atmospheric Airship will come flying into view from the left side of the screen, while firing missiles at you; once you have fired enough shots at it to kill it, the screen will scroll to the right again, then start scrolling inwards again as the text "THEY'ER HEADED FOR THAT ISLAND. THAT'S DELTA'S WEAPON FACTORY!" appears at the bottom of the screen with a gray map on its left side:
Three more Mosquitoes will then emerge from the ocean in front of you and start firing "energy bombs" at you; once you've fired enough shots at each of these three to kill them, the screen will scroll upward, then scroll to the right once again, then scroll outward again, then start scrolling to the left, as three more Atmospheric Airships, four Airship Zaku, and a nineteenth Boater Zaku fly and hover into view from its right side while firing shots at you. Once you have fired enough shots at each of them to kill them, an eighth Mosquito will come flying into view from the left side of the screen, and start firing "energy bombs" at you - and once you have fired enough shots at him to kill him, three more Atmospheric Airships will come flying into view from the right side of the screen, while firing missiles at you. Once you've fired enough shots at each of these three to kill them, the screen will scroll outward again, then start scrolling to the right yet again, as eight more Atmospheric Airships and two more Airship Zaku come flying into view from its left side while firing shots at you; once you've fired off enough shots at each of these to kill them, the screen will start scrolling inwards once again as two more Atmospheric Airships emerge from the ocean behind you and start firing "energy bombs" at you. Once you have fired enough shots at both of them to kill them, the screen will crash through a wall, as it jumps over a pipe - and five Beam Guns will then emerge from the left and right sides of the screen to start firing shots at you. Once you have fired enough shots at each of these to kill them, the screen will start scrolling to the left again, as two more Airship Zaku come flying into view from its right side, while firing shots at you; once you've fired enough shots at both of them to kill them, three Zaku will come running into view from the left and right sides of the screen, while firing shots at you. Once you have fired a shot at each of them to kill them, a Tarantula will come running into view directly in front of you from the left side of the screen, then start firing shots at you - and once you've fired enough shots at him to kill him, two more Airship Zaku and a ninth Mosquito will come flying into view from the right side of the screen, while firing off shots and "energy bombs" at you. Once you have fired enough shots at each of them to kill them, five more Zaku will come leaping directly towards you while firing shots at you; once you have fired a shot at each of these to kill them, a fifty-eighth Atmospheric Airship and another Tarantula will come flying and running into view from the right and left sides of the screen while firing missiles and shots at you. Once you have fired enough shots at both of them to kill them five more Zaku and a Domu will come leaping directly towards you while firing shots and missiles at you - and once you have fired enough shots at each of them to kill them an eleventh Airship Zaku will come flying into view from the right side of the screen while firing shots at you. Once you have fired enough shots at him to kill him, five more Zaku will come leaping directly towards you, while firing shots at you; once you have fired a shot at each of these to kill them, a third Tarantula will come running into view directly in front of you from the left side of the screen, while firing shots at you. Once you've fired enough shots at him to kill him, three more Atmospheric Airships will come flying into view from the right side of the screen while firing missiles at you - and once you have fired enough shots at each of them to kill them, two more Mosquitoes will come up from behind the gas tanks in the background and start firing more "energy bombs" at you. Once you've fired enough shots at both of them to kill them, five more Zaku will come running into view from the left and right sides of the screen while firing shots at you; once you've fired a shot at each of these, to kill them, five more Airship Zaku will come flying into view from the right side of the screen while firing shots at you. Once you've fired enough shots at each of these, to kill them, two Innocent Bystanders will come running into view from the left side of the screen, as that text "DON'T SHOOT" appears above them - and two more Tarantulas will then come running into view on the left side of the screen while firing shots at you. Once you've fired enough shots at both of them to kill them, a seventeenth Airship Zaku and a twenty-fourth Zaku will come flying and running into view from the right side of the screen ,while firing shots at you; once you have fired enough shots at both of these to kill them, two more Zaku will drop down to the ground from the top of the screen, and start firing shots at you. Once you have fired a shot at both of them to kill them, a sixty-second Atmospheric Airship will come flying down into view from the top of the screen and start firing missiles at you - and once you've fired enough shots at it to kill it, three more Zaku will come running into view from the right side of the screen while firing shots at you. Once you've fired a shot at each of them to kill them, an eighteenth Airship Zaku and three more Tarantulas will come flying (and running) into view from the right and left sides of the screen, while firing shots at you; once you have fired enough shots at each of these to kill them, two more Zaku will come running into view from the right side of the screen while firing shots at you. Once you have fired a shot at both of them to kill them three more Zaku will come leaping and running into view from the left and right sides of the screen while firing shots at you - and once you have fired a shot at each of them to kill them a thirty-fifth Zaku will drop down to the ground from the top of the screen and start firing shots at you. Once you've fired a shot at him to kill him, five more Zaku and a nineteenth Airship Zaku will come running (and flying) into view from the left and right sides of the screen while firing shots at you; once you have fired enough shots at each of these to kill them, two more Innocent Bystanders will come running into view from the right side of the screen, as that text "DON'T SHOOT" appears above them. Another Domu will then come up from behind a stack of six crates in the background, and start firing missiles at you - and once you have fired enough shots at him to kill him, a forty-first Zaku will come up from behind a second stack made up of two more crates in the background, and throw a grenade at you. Once you have fired a shot at him to kill him, two more Airship Zaku will come flying into view from the left side of the screen while firing missiles at you; once you fire off a shot at both of them to kill them, a ninth Tarantula and two more Zaku will run into view from the right and left sides of the screen, while firing shots at you. Once you've fired enough shots at both of them to kill them, three more Airship Zaku will come flying into view from the right side of the screen, while firing shots at you - and once you have fired enough shots at each of these to kill them, two more Zaku will come running into view from the left and right sides of the screen while firing shots at you. Once you fire a shot at both of them to kill them, a sixty-third Atmospheric Airship will fly down into view from the top of the screen, while firing missiles at you; once you've fired enough shots at it to kill it, two more Zaku will come running into view from that left side of the screen, while firing shots at you. Once you've fired a shot at both of these to kill them, a third Domu will come up from behind a third stack of five more crates in the background, and start firing missiles at you - and once you have fired enough shots at him to kill him, two more Zaku will come running into view from that right side of the screen, while firing shots at you. Once you've fired a shot at both of them to kill them, a fiftieth Zaku will come up behind a fourth stack of two more crates in the background, then throw a grenade at you; once you've fired a shot at him to kill him, five more Zaku will come running into view from the left side of the screen while firing shots at you. Once you have fired a shot at each of them to kill them a fourth Domu will come up from behind a fifth stack of seven more crates in the background and start firing missiles at you - and once you have fired enough shots at him, to kill him, four more Airship Zaku and a twelfth Mosquito will come flying into view from the left and right sides of the screen, while firing missiles and "energy bombs" at you. Once you have fired enough shots at all of these to kill them five more Zaku will come running into view from the left and right sides of the screen, while firing shots at you; once you have fired a shot at all of these to kill them, a twenty-ninth Airship Zaku will come flying into view on the right side of the screen, then start firing shots at you. Once you've fired enough shots at him to kill him the screen will start scrolling inward yet again as two more Atmospheric Airships and a thirteenth Mosquito come flying into view from behind you while firing missiles and "energy bombs" at you - and once you've fired enough shots at each of them to kill them, the screen will jump up over the gas tanks ahead of you, as nine more Beam Guns emerge from the left and right sides of the screen and start firing shots at you. Once you have fired enough shots at each of these to kill them, you will come to a barrage of five more Domu, who are firing missiles at you; once you have fired off enough shots at all of these to kill them, the screen will scroll to the right for a fifth time, as four more Zaku come leaping into view from its right side while firing shots at you. Once you've fired a shot at each of them to kill them two more Tarantulas will come running into view from the right side of the screen while firing shots at you - and once you have fired off enough shots at both of them to kill them, five more Zaku will come running into view from the left and right sides of the screen while firing shots at you. Once you have fired a shot at each of them to kill them, a seventieth Zaku will slide down into view on the pole in the background from the top of the screen and start firing shots at you; once you have fired a shot at him to kill him, three more Domu will run into view from the left side of the screen (on the balcony in the background), and start firing missiles at you. Once you have fired enough shots at each of them to kill them, two more Zaku will run into view from the left and right sides of the screen while firing shots at you - and once you've fired a shot at both of these to kill them, two more Domu will drop down onto the aforementioned balcony in the background, then start firing missiles at you. Once you have fired enough shots at both of them to kill them a thirtieth Airship Zaku, two more Zaku, a twelfth Tarantula and two more Domu will come flying and running into view from the left and right sides of the screen, while firing shots and missiles at you; once you have fired enough shots at each of them to kill them, two more Atmospheric Airships will fly down into view from the top of the screen while firing missiles at you. Once you've fired enough shots at both of these to kill them, two more Zaku will come running into view from the left and right sides of the screen (again, they're on top of the aforementioned balcony in the background) while firing shots at you - and once you have fired a shot at both of them to kill them, two more Innocent Bystanders will come running into view on the right side of the screen as the text "DON'T SHOOT" appears above them. A fourteenth Mosquito will then come flying into view from the left side of the screen while firing "energy bombs" at you; once you have fired off enough shots at him to kill him two more Airship Zaku will come flying into view from the left side of the screen, while firing shots at you. Once you have fired enough shots at both of these to kill them, two more Zaku will run into view from the right side of the screen (the seventy-seventh one is on a second balcony in the background) while firing shots at you - and once you have fired a shot at both of them to kill them, two more Atmospheric Airships will come flying into view from the right side of the screen, while firing missiles at you. Once you have fired enough shots at both of these ones to kill them, six more Zaku, a seventeenth Domu, and a thirteenth Tarantula will come running into view from that right side of the screen (the third of whom is, again, on that aforementioned second balcony in the background) while firing shots and missiles at you; once you've fired enough shots at each of them to kill them, an eighty-fourth Zaku will slide down into view from the top of the screen on another pole in the background and start firing shots at you. Once you've fired a shot at him to kill him an eighty-fifth Zaku will drop down to the ground from the top of the screen and start firing shots at you - and once you have fired a shot at this one to kill him, two more Mosquitoes will come flying into view on the left and right sides of the screen while firing "energy bombs" at you. Once you fire off enough shots at both of them to kill them, the screen will start scrolling inward for a fifth time, as two more Beam Guns emerge from the left and right sides of the screen and start firing shots at you; once you've fired enough shots at both of them to kill them, two more Mosquitoes will come flying directly towards you while firing "energy bombs" at you. Once you have fired off enough shots at both of them to kill them a twelfth Beam Gun will emerge from the right side of the screen and start firing shots at you - and once you have fired enough shots at it to kill it three more Zaku will come running directly towards you from the left and right sides of the screen while firing shots at you. Once you have fired a shot at each of them to kill them two more Beam Guns will emerge from the left and right sides of the screen, and start firing shots at you; once you've fired enough shots at both of them to kill them, three more Zaku will come running directly towards you from the left and right sides of the screen while firing shots at you. Once you've fired off a shot at each of these to kill them, a seventieth Atmospheric Airship will fly into view from the right side of the screen, while firing missiles at you - and once you've fired enough shots at it, to kill it, three more Zaku will come running directly towards you from the left and right sides of the screen, while firing shots at you. Once you have fired off a shot at all of these to kill them, a seventy-first Atmospheric Airship will fly into view from the screen's left side, while firing missiles at you; once you have fired enough shots at it to kill it, three more Zaku will come running directly towards you from the left and right sides of the screen while firing shots at you - and once you have fired a shot at each of them to kill them, the screen will scroll to the right for a sixth time as the text "IT LOOKS LIKE DELTA IS JUST A FRONT FOR VANGUARD! THE ARMY CAN HANDLE IT NOW." appears at the bottom of it, then start scrolling inward for a fifth time as the big blue aeroplane that had flown into view at the end of the previous act comes in to land, and opens up at the back before going into it (again, there is no boss for this act) as the song that you were hearing from the Yamaha YM-2151 fades out. Both players' scores (not displayed during gameplay), will then be displayed at the top of the screen below the text "1UP" and "2UP", and their hit/miss ratios on either side of the text "HIT RATE" above the shot of that unnamed Neo Arc female operative; the text "REPAIRING DAMAGE" and "WEAPONS SUPPLY" will also be displayed below it, and a third map will appear on top of the shot as the text of "THE VANGUARD LEADER HAS ESCAPED UNDER GROUND. LET'S GO AFTER HIM!" appears below it:
Garcia and Cliff (who, like in the previous act, have not been informed of "Today's Grievances" by the Neo Arc Police Chief) will now proceed onto Act 4.