Crossword Puzzle Who the USO entertains

Clue: Who the USO entertains

Theory of unified wholes (HOLISM with 6 letters)
Whodunit theme (INTRIGUE with 8 letters)
Theater-floor litter (STUBS with 5 letters)
Work first publicly performed at the Theater an der Wien in 1805 (EROICA with 6 letters)
Lengthy theme (ESSAY with 5 letters)
Theda et al. (BARAS with 5 letters)
Bit part in a whodunit (CORPSE with 6 letters)
Therapy, to a G.I. (REHAB with 5 letters)
Aliases, and a hint to the puzzle's theme (ASSUMEDIDENTITIES with 17 letters)
Hesiod's "Theogony," e.g. (EPOS with 4 letters)