Command & Conquer 3: Tiberium Wars/Nod support powers

Decoy Army
The Decoy Army power first has you select a target area, and then a second target area. Any targets in the first will be falsely duplicated on the second target area. While these new units do no damage (but appear to attack if possible) and die in a single hit, they still visually look like hostile units on your enemy's screen and on their radar. This makes for interesting diversion tactics, a chance to draw fire from your own units, or even for scouting out uncharted territory. Overall not often used, however.

Radar Jamming Missile
The Radar Jamming Missile doesn't create any form of missile really, but instead it completely jams your opponent's minimap, preventing them from seeing anything outside their own screen. It is the perfect power when you simply want to annoy someone and put them on the defensive for about 10 seconds - the uncertainty that they face will likely be more than enough for you to get some breathing space and is a great precursor to an attack...or to bluff your way into thinking you're attacking your base when really you're not.

Cloaking Field
Although most Nod vehicles can cloak themselves, quite a few cannot. Using this power on them renders them invisible except when attacking, just like an ordinary Stealth Tank. Needless to say, this is an extremely useful power. It is perfect for sneaking a few Flame Tanks through a back door of your opponent's base to roast their conyard.

Shadow Strike Team
This power summons a pair of veteran Shadow Teams to any location on the map. Just like GDI's reinforcement powers, however, they fly into the battlefield via their gliders, making them extremely vulnerable to AA fire. It is therefore best to deploy this power outside the enemy's base, then sneak them in on foot. This power is often used online to get an extra pair of shadow teams, especially for the Shadow Team rush.

Mine Drop
This power summons an Armageddon bomber (a specialist bomber that deploys support powers) to cover the target area with stealthed contact mines. An extremely useful ability, since it covers an extremely large area and the plane that flies in is extremely fast. It is best used in front of an enemy war factory or refinery, to force harvesters and newly created vehicles to run over the mines as soon as they're made. Although it's slightly more expensive than an APC's mine drop, it covers a larger area and can be flown in instead of requiring a nearby vehicle.