The Air Force Wright Laboratory, Dayton, Ohio, USA, has been awarded the Ig Nobel Price of Peace, for instigating research & development on a chemical weapon -- the so-called "gay bomb" -- that will make enemy soldiers become sexually irresistible to each other. The reference work: "Harassing, Annoying, and 'Bad Guy' Identifying Chemicals," Wright Laboratory, WL/FIVR, Wright Patterson Air Force Base, Ohio, June 1, 1994.
Such "gay bomb" would fall into Cathegory 3 chemical weapons: those which "affect human behavior so that discipline and morale in enemy units is adversely affected. One distasteful but completely non-lethal example would be strong aphrodisiacs, especially if the chemical also caused homosexual behavior."
Apart of the joke of gay bombs, gay sprays or whatever you might consider, what's clear from this work is that by 1994 at least, the USA Air Forces, or at least some of their personnel, were trying to find new ways on chemical weapons, while some years later accussing other countries of their own procedures. Now who's got WMDs?