This is a brand new short sleeved Gilden 6.0 oz 100% cotton  t-shirt.  It's a tribute shirt to the CH-46 Sea Knight helicopter which was put into retirement in 2015.  

The left chest has the Phrog skeleton with the text wrapped around it.  The full back logo consists of the three Phrogs in formation and the text "Phrogs don't die...  They just go to hell and regroup" wrapped around them.

Disregard the black left chest logo on the olive drab shirt.  The actual color is white on all three shirt colors.