I'm fairly certain this is not entirely accurate, I am not saying that MV's comply with the FMVSS, I am saying they comply with Mil-STD-1180B, which specifies MV's shall comply with applicable FMVSS standards. Wi TR-11-0016 precedent and the AM General NHTSA Letter both agree with this. Re Crash ratings, seatbelts etc Mil-STD-1180 explicitly references FMVSS as the governing standard (specificaly standard no 201 207, 208, 209, 210).
I think the key here is section 1.2 and 5.4 of Mil-STD-1180B, Excerpts below.
Re lighting, Oshkosh Mv's with blackout lights have an FMVSS compliance decal on the door stating compliance. PM me if you want to chat more on this or have concerns with my approach affecting others
"1.2 Purpose. The purpose of this standard is to establish uniform requirements for incorporating Federal Motor Vehicle Safety Standards into military ground vehicles consistent with their military characteristics. This standard establishes uniform requirements which satisfy the intent of, and are identifiable with comparable Federal Motor Vehicle Safety Standards. The provisions of this standard shall not be construed to be the only safety requirements applicable to military ground vehicles."
"5.4 Application of FMVSS. The application of specific requirements within the FMVSS’S, military wheeled vehicles designed to (a) carry 10 passengers or less and (b) have a gross vehicle weight rating (GVWR) of less than 10 000 pounds, shall comply with those requirements which apply to “passenger cars”. Military wheeled vehicles designed to carry more than 10 passengers, shall comply with those requirements which apply to “buses”. Military wheeled vehicles which have a GVWR equal to or greater than 10,000 pounds, shall comply with those requirements which apply to “trucks”.
edit - an extra 0