>  If some branch of
> the armed forces has discontinued its use, it's more likely to to
> lobbyist cash than any actual study.

Actually, I know the Air Force at least banned its use due to safety
concerns. In one case a pilot applied Armor-All to the sidewalls of the
tires on his aircraft. In the process, he got it all over the brake rotors.
Subsequently, the next time he landed he couldn't stop and ran off the
runway, damaging his aircraft. In typical military efficiency, they simply
banned the use of cosmetic enhancers rather than go through the unnecessary
trouble of devising a set of rules for their appropriate use (a shiny dash
or sidewalls are, after all, not necessary to fulfill any of their
missions).

--
John Bange
'90 Vanagon - "Geldsauger"