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FOB Spectre is the first Strike Force mission. The primary objective for this mission is to defend points from attack. You have 3 units, the SEALs, Sentry and the CLAW. This mission is in the form of a tutorial. First you have to take control of the CLAW by pressing down on the D-pad. Press the Fire button to use the CLAW's machine guns, and press the grenade button to launch grenades.
You will then be prompted to take control of a soldier, by pressing either left or right on the D-pad. You will then be prompted to switch to the third and final unit, the sentry. These sentries cannot move, so are inheritantly less effective than the soldiers and the CLAW. You will finally be prompted to switch to Tactial View, by pressing Select.
To command a unit on this screen, press the corresponding button of that unit, then press the prompted buttons to move this unit to the desired location. However, it is significantly easier to control these units yourself. After this, a practice target will enter the battlefield. Move the cursor over this target on Tactical Mode, and press the prompted button. Shortly after this, you will start the mission.
Now, the only objective is to destroy these units before they reach the points. There's no real strategy to this, other than keeping at least one unit on each point. It doesn't matter if a point gets destroyed, just make sure that at least one of them is intact by the end of the mission. The mission has a duration of around ten minutes, and after it concludes you will be prompted to kill the remaining enemies, and after that, the mission ends.