My husband can't get out of his vehicle to pump gas or run into a convenience store for a soda in his uniform. I seriously doubt anyone in the military would break this rule, especially for a televised support rally.
They could show up wearing shorts and t-shirts, however.
Can't pump gas? Because it looks undignified?
Huh??? I can not leave my house without seeing a soldier in uniform: restaurants, grocery store, Wal-Mart, Lowes, car dealership, real estate office ...
Don't get me wrong - I love seeing them. I have become more pro-active in that I walk up to them and thank them for their service or quietly pay their tab as I leave.
Where and what service? I live near Ft. Hood, and we see troops, I've personally seen officers as high as Lt. Col., in all the restaurants, all in BDU's.
At one time, long ago and in a galaxy far away, we could not wear fatigues (pre BDU days) off base, but we could wear our "regular" uniforms. Including both the ones with the blouse (jacket to civilians) and the one with a shirt only, with or without tie.