After four years in the USAF for some reason I joined the USNR.
Just before the cruise some old salt told me: "Jimmy, grab the top bunk as your first order of business."
I got the top of 5 bunks in a section of the USS Purdy which was older than I was at the time.
Good advice....the guy in number 4 puked all the way to San Juan on the three swabbies below him!