I really think this is one of the best pictures for this challenge. The subjects are well composed not to mention there is a kinda "oh, wow, thats awsome" mood to it.
That's a stroll! Body language doesn't match being on march... At least not in my memory of boot camp days... Too much going on in the background takes away from the main subject of the shot. Like the road, just too much unnecessary stuff to the right of the three.
TC
I like the sky in this one. So unreal... However, the buildings on the right seem a bit overexposed. Composition: excellent, obviously there is a three, good DOF. 7.