[rolling_stone]

military does not normally salute indoors unless “reporting” to an officer...

[reed13k]

Navy only salutes when covered and we don’t wear covers indoors. so....

[Wegelhof]

military does not normally salute indoors unless “reporting” to an officer...

I hear ya. But were those Marines officially in doors? I thought a salute was required.

[stylin19a]

ThankQ
The Marines were covered and holding the doors open outside.
Unless it’s changed, Marines do not cover indoors except under arms.