[KC Burke]

you are right about the oxygen depleting aspects, however, the flash-over time in a small vehicle confined space is so short that this is not the contoling factor in this test date. The Ozone depletion issue appears to be the factor initiating the change as shown by the report, IMHO

[RightWhale]

It's the ozone, is it? What would the EPA do if all the Abrams tanks caught fire at once? Run down to Antarctica and take emergency ozone readings? Abrams tanks are lucky they are still allowed to fire a shell during combat; EPA would probably spike their gun, too, if they could.