Other weapons that never saw the light of day include one to make soldiers obvious by their bad breath.
The US defence department considered various non-lethal chemicals meant to disrupt enemy discipline and morale.
The 1994 plans were for a six-year project costing $7.5m, but they were never pursued.
The US Air Force Wright Laboratory in Dayton, Ohio, sought Pentagon funding for research into what it called "harassing, annoying and 'bad guy'-identifying chemicals".
Scientists also reportedly considered a "sting me/attack me" chemical weapon to attract swarms of enraged wasps or angry rats towards enemy troops.
A substance to make the skin unbearably sensitive to sunlight was also pondered.
In a variation on that idea, researchers pondered a "Who? Me?" bomb, which would simulate flatulence in enemy ranks.
Indeed, a "Who? Me?" device had been under consideration since 1945, the government papers say.
clipped from: news.bbc.co.uk 