Yes, commercial only. I was not recommending the DL, just throwing that out as a possible explanation as to how some airline guys might be towing gliders. That could get you fired just for doing it, and also violated if you exceeded flight time limits.

You can also CFI all you want, as long as you don't get paid for it.

Military flying is TOTALLY removed from the FARs, so it doesn't count. Your airline should allow you adequate rest before returning to work from military duty.