It is a good idea to make a meta unit for a quick battle, but friggen bombers, and planes and medics are faster than the ground units and thus get taken out by the other armies anti-air.
You need a way to make formation. it is hard enough as it is to select out the air amoungst 100's of units.
One example is if you assign your army to attack at various points, and then do something else, o.e., give 10 commands.
The medics, and the air get to the check points first and get taken out, this also includes engineers
This is why you need to allow units to follow each other. This way I can tell my medics to follow a unit at the back
