A man in a military uniform is playing the drums in a marching band.
an rotc member plays the drums during a halftime show
Just because the man is in a military uniform doesn't mean he is a rotc member. He could be playing in a parade or just practicing not necessarily during a halftime show.
exists e1 s1 s2 x1 x2 x3 x4.(n_drum(x3) & in(e1,x4) & n_band(x4) & a_marching(s2) & Theme(s2,x4) & Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & in(x1,x2) & n_uniform(x2) & a_military(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2 x3 x4 x5.(n_drum(x3) & during(e1,x4) & n_show(x4) & of(x4,x5) & n_halftime(x5) & Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_member(x1) & of(x1,x2) & n_rotc(x2))