I was a lieutenant. I think I was the only one in the Pentagon I saw, the whole time I was there...
I was asked to attend a USMC Conference at HQMC PP&O. I was an E-7, the lowest rank there. But I was the Navy subject matter expert for that conference. I damn near laughed out loud when a Marine LtCol went around and asked for everyone's coffee requests. To be fair, he was responsible for hosting the conference. But, had I been the host, I would have asked a Petty Officer to volunteer to handle refreshments and then give him a 72 hour liberty, (weekend of his choice) and Letter of Appreciation. I would have had a lot of volunteers.