You think that all ex Marines will refuse to salute during the raising or lowering of the flag, or the playing of the national anthem because they aren’t wearing a hat?
If they choose not to salute, they can still put their hand over their heart like other civilians.
“If they choose not to salute, they can still put their hand over their heart like other civilians.”
That’s what they were taught. BTW, there are no ex-Marines.