[@Pugbutter] Thanks! The B&W is going to be colored, by the way; it's just easier for me to adjust things while in greyscale. However, a B&W as an end product is also definitely possible, or maybe something with very minimal coloring.

Uniforms and military gear: I'll have to have proper reference, since I'm not very well-versed in military history myself and might use the wrong pictures as reference if I just look something up, but with the right reference it should be pretty doable. 
I've done a few armors before, so while I'd definitely do a few more quick metal studies first to get back into it some more, I don't think it'd be a problem.

Just to make sure I understand correctly; you're talking about a digital piece, but with a border drawn around it, right?