When is it appropriate to salute indoors?

This guy is a Marine, I don't have a dog in this hunt. I will let the Marines respond to this one.

Keep this thread going.

Marine corps regulations on saluting indoors is only under arms i.e. while on guard duty military police drill instructor wearing green web belt or senior drill instructor wearing black sam browne belt signifiying they are under arms color guard or silent drill team or nco or officer wearing a mamaluke or nco calvery sword
Now for the confusion that this seargeant is under arms bc hes wearing a white belt the white belt with brass plate for e3 and bellow and white belt brass plate with e.g.a. for ncos and officers is the correct belt for dress blues alphas and bravos
This being said i dont know why this marine is covered indoors maybe special detail?

My response, I see a Marine locked in at attention showing respect for the colors. He may not have done it perfectly per regs, but I think our Brother represented all of us well. As a community we Veterans and Active Duty should close ranks and defend each other, because God knows everyone wants a piece of us if we screw up the slightest. Carry On!

How does an AR which is a army regulation really help you to understand the Marine Corps regulations

I'm going to give the Sgt the benefit of the doubt that he knows what he is doing and that this isn't the National Anthem being played, but America The Beautiful.

Marines do not salute indoors

This is interesting to me. The person in the shot is not saluting in the normal sense. He has his hand over his heart as when you make a pledge (THE pledge). I've always associated that with the act of pledging, not saluting, or honoring the flag. I've always considered people placing their hand on their heart during the National Anthem as a well-meaning misunderstanding.

I'd like to hear any expert clarification on this.

If the Marine is covered, he salutes. If indoors, he is covered if carrying a side-arm, or wearing a duty belt. If covered indoors and putting your hand over your heart, your an idiot. At least he could stand-up straight. Was this Marine wounded overseas??

As a Marine, it's pretty simple. You are covered and Salute when outside and if inside, only when considered under arms. A Marine does not otherwise where a cover inside, nor Salute inside.