ACU = Army Combat Uniform. Basically the Army copied the Marines and created a new digital camo uniform with more functionality. The pockets are slanted for easier access, there are openings to slide in body armor plates and knee-pads, pen holders on the sleeves, everything is velcro instead of buttons, and the cargo pockets have drawstrings. All unit patches, flags, rank, and nametapes are velcro so there's no more having to get them sewn on and removed. The material is soft and wrinkle-resistant so you just throw it in the washing machine like normal clothes...no dry cleaning required. You also have to wear the official ACU desert boots with it.

http://www4.army.mil/ocpa/read.php?story_id_key=6042

My hubby: