This is straight from the Pilot Credentials website:

Q: Can I use a conversion factor when determining flight time accumulated in the military?

A: Yes. You may add a plus (.2) per sortie factor to your flight times. Please note that this conversion factor is applied to each sortie not to total time.

I have flown heavy aircraft for the Air Force my 20 year career, but I still added the .2 conversion. It only added a few hundered hours.

Just my .02 cents.