The "military" is using these areas to train for war - which means that many of these items are live ordnance. We use well-trained professionals to find and dipose of this stuff, rather than let some unskilled sorts blow themselves and their trailers to bits.
Pretty clear you've never worn a uniform, or you would've figured that one out. (That and "military" is an adjective, not a noun.)
Interesting. The first paragraph of your post was informative and civil. You looked good. Then you added the second the paragraph, which made you sound like a rude ass in addition to being incorrect. “Military” is both an adjective and a noun.
Main Entry: military
Function: noun
Inflected Form(s): plural military also mil·i·tar·ies
Date: 1709
1: military persons; especially : army officers
2: armed forces
http://www.merriam-webster.com/dictionary