When is it appropriate to salute indoors?

If in doors for national anthem and in uniform, you stand at attention and face the flag...if in civilian clothes, face the flag and put you hand over your heart....You would salut the flag during the posting of colors but not during the national anthem inside....

I have been out of service for quite some time, but my understanding was thet MARINES salute indoors only when confronted with a Medal of Honor recipient. Other services had their own salute traditions. Why is this an issue any way? The Marine pictured had his hand over his heart----a form of a salute. he rendered honors, and showed respect. If,,,,,IF he was not compliant with USMC regs, then retrain him. If he was compliant, then get over it...this is an example of a non issue being blown the EFFF up for no reason, especially since the original post mentions ARMY REGULATIONS specifically AR600-25 which does not apply to Marines.

Some good answers here. In the Navy, when wearing a duty belt, you wore your cover even indoors. That allowed the salute by the one wearing the cover and a return greeting of the day if the other member was not covered.

We.salute in hanger bays on board ships in port. This was a large arena, if he is covered and standing alone, it is ok

Why is he still wearing his cover ?

AR = Army Regulation. What does the Marine Corps Regulation say?

As far as Marines go, indoors= cover off and position of attention. Outdoors= salute.

I've been in indoor ceremonies that were dubbed outdoor ceremonies, so we were required to wear a cover and salute. Not sure with this Devil Dog is putting his hand on his heart instead of saluting though. Maybe he's an actor.

While in the Army all ceremonies in and around deployments and homecomings were treated as "outdoor" ceremonies. Thus we saluted.
I would assume that all services have something close to the same regulation concerning saluting indoors. There is a United States Code U.S.C that allows for active duty and veterans to salute the flag while indoors of out.

Since the majority of the civilian populace and sister services wouldn't understand why a Marine would be just "standing" there at the POA, I'm going to guess he did it to conform to said event. Every service handles the anthem differently in various situations. This guy is in a no win either way. He salutes and the Corps rages. No salute and the average Joe and apparently other branches rage. He picked a happy medium and still caught grief. But since he's a Sgt with a service stripe and two weapons quals, he'd probably tell everyone to kick rocks and knifehand you for questioning him.