Added RHS, LAV25 & HAFM Overhaul USAF content

U.S. weapons, gear, items and vehicles added from RHS, LAV-25 and HAFM
Overhaul.
At this point LAV-25 and HAFM Overhaul mods are required
Merge pull request #5 from MDTorch/importRHSUScontent

Added RHS, LAV25 & HAFM Overhaul USAF content