Straight from the Podcast intro...
Danger Close is the term that indicates friendly forces are in close proximity to the target you are trying to destroy with bombs, bullets, artillery, mortars and of course, Naval Gunfire. In others words, find something to hide behind and get your damn head down.
If you don't listen to the podcast, this shirt will likely be lost on you, and that's ok.
60/40 Poly/Cotton blend