Mechanics Wear

Moreover, it is the other army uniforms?

Here you go, feel free to browse at your leisure. (All the uniforms of the army uses, including the flight suit):

http://www.army.mil/usapa/epubs/pdf/r670 ...

I know that the Air Force uniform for the most part, but what I know, the sort uniform

Combat Uniform ACU-Army

DCU-Desert Combat Uniform (think beige and brown uniform Desert Storm)

Camouflage BDU-Old school.

Combinations may be blue-or green, a costume piece mechanics use to keep clean uniforms

The green flight suit, a costume piece with special stains for the name / rank and unit.

Airman Battle Uniform ABU

I think your word combination .. its just something worn on top of the ACU is usually by aviation mechanics and other things. Do not worry you'll always ACU, but you do not want to be ACU wicked and bold:) Personally, I hate combinations .. It is therefore hampered the search, in my opinion. but it is not What Ya Gonna Do:)