...my 28-year military service began in the early 1960s; even back then, we were told that participation in ANY political even while in uniform was strictly prohibited...! even as an E-1 Seaman Recruits we knew this sort of behavior was verboten. Today I doubt that this prohibition is even discussed within today’s US military...hell; it’s bad enough when sworn police officers kneel at BLM protests (sorry; riots...) shameful, all of it...(unless you are of the African persuasion, apparently....)
I was told in 2001, but 19 years seems like a different world to me.