Military display work on body (6)
I believe the answer is:
tattoo
I believe this clue is a double definition.
'military display' is the first definition.
(I've seen this before)
'work on body' is the second definition.
(work of art on someone's body)
(Other definitions for tattoo that I've seen before include "Skin painting" , "one has to beat" , "Indelible picture made in the skin" , "drawing on arms, perhaps" , "that leaves a permanent impression on one" .)