Are you referring to the video where they walk by the Airforce Airman standing at Attention with the rifle in his right hand? If so, that is why he didn't salute. He was standing at the position of Attention with his rifle at Port Arms. He also was indoors, and not reporting to an officer.

**United States Marines: ** Salute outdoors. Do not salute indoors, unless under Arms. Marines do not salute without a head cover. Do not wear cover indoors, unless under Arms.

**United States Army and United States Air Force: ** Salutes with head both covered and uncovered. Do not salute indoors except when formally reporting to a superior officer or during an indoor ceremony.

**Just some further trivia in regards to salutes: ** While military members aren’t required to salute Medal of Honor recipients, they are encouraged to do so as long as the recipient is physically wearing the medal, even when the recipient is in civilian clothes.

Medal of Honor recipients are the exception to this custom, regardless of the MOH recipient's rank, officers and enlisted Service members render the hand salute first.

Also, while military salutes in other situations are always up the the rank structure — meaning the junior soldier salutes the senior one — anyone may render a salute to a MoH recipient first. There have even been cases of American presidents saluting MoH recipients.