A Previously Undisclosed Jason Ingersoll Image From the Pentagon on 9/11

Was it a narrative dud? Do bears shit in the woods?

Its caption reads:

"A firefighter places an American flag on his firetruck. The flag was found undamaged inside the Pentagon after a hijacked airliner crashed into the building, Sept. 11, 2001. U.S. Marine Corps photo by Cpl. Jason Ingersoll" Link

["Defend America: U.S. Department of Defense News About the War on Terrorism Photo Essays Remembering 9/11]

Um, excuse me, but why is this fireman stealing government property? Next thing you know it'll be stacks of Levi's jeans. And who is Rudi Williams?

"A National Guard military policeman stands guard in a Pentagon hallway to prevent people from entering the darkened area behind him that leads to the site where a hijacked airliner crashed into the building, Sept. 11, 2001. Defense Dept. photo by Rudi Williams" Link

Why is the National Guard serving this duty? Don't they have to be officially called out?