When I was in college, c. 1986 or so, a local band ("Bad Flannel") who had some engineering students as members, acquired a gizmo to strobe regular flourescent lights plugged into it which were, of course, referred to as 'barf lights' and had a huge party, playing proto grunge like Hüsker Dü's "Data Control" and Flipper's "Sex Bomb" having guaranteed that everyone would barf underneath the raging strobes. Apparently these things were not guaranteed as I don't recall anyone barfing, except from alcohol poisoning.
It sounds like it could be an interesting weapon though. The US Military could be in danger of becoming ridiculously cheezy though. Not only will they blast you with MC Hammer, they will now make you barf while they are doing it.