Some babbling for your enjoyment.

Ground Vehicles - (esp Strikers and BTR) - Move the infantry close to objective but dismount at a point concealed from view of tangos at objective. Let dismounts advance and then let them direct the vehicle to provide fire support. E.g. Dismounts move over ridge, take fire from 50 cal, take cover, mark 50 cal position on spin map, vehicle flanks 50 cal slightly, takes out 50 cal, infantry resume advance.

Helicopters -
Team leader can use Little Bird (slick) as a C&C Bird. Find fire support position (usually high ground overlooking target) and mark it. Blackhawk inserts* fire support team (e.g. sniper, 2 mortars, one medic/security guy). Fire support team gets into position but stays quiet. Medic marks target with TD, Sniper puts out claymores to secure position.
Leader then marks 2nd LZ for assault force. This is similar to dismount point for ground vehicles (GV). Blackhawk drops assault team or better yet Chinook drops assault team mounted in AAVs.
On leader's command, empty transports** + Little Bird gunships engage objective. Fire support team opens fire, trying to time last mortar round to drop right as Assault enters target zone. Assault team goes in. Have one or more AAV dismount short of target and have balance of AAVs go straight in, ideally dismounting behind smaller outlying bunkers or other cover/concealment.
Once Assault is in the zone, Helos + Fire Support element move to interdict reinforcements coming from nearest enemy spawn. These elements can also move to the objective if Assault requires reinforcement.

*Helo Insertions. Don't give the LZ away. Don't overfly the target. Go beyond visual range of the target and pick a route to LZ that does not expose helo to target. Come in low, don't hover and then descend. Don't shoot or use flares unless you are taking fire. LZ should always be concealed from enemy view by terrain or foliage.
**Empty Transports as gunships. The Puma and Blackhawk can be used effectively in this role with one gunner. Orbit with gunner side facing target, 300 to 500 meters from target, altitude 250-300 Make a very slow turn (use the mouse) that keeps your bird steady and keeps the gunner's pipper on the target. Ideally he doesn't even have to adjust his aim. Hold down the flare button constantly and fly at max speed. A good gunner and a good pilot can do this almost indefinitely. Concentrate fire on bunker slits, roof of bunker, and anything that has tracers coming out of it.