Mil power is full cold power - what used to be called max continuous.
This is because in early jets afterburner/reheat was an on-off system and, due to the temperatures involved, could only be used for short bursts of around 30 seconds. In modern jets afterburner is more modulated with various stages from min to max burner.
Jets of the last generation used burner for take-off, the Jaguar for example. The latest generation have sufficient thrust they don't need to use it, saving wear and tear on the jet and the runway, and keeping it in case a problem.
In the case of FBW jets there are other issues concerned with handling when changing configuration. The loss of an F-22 prototype was due to the different handling when the gear was up or down, to the extent the pilot got into a phugoid and shut the throttle and rode into the runway as he was losing control.
So if a pilot selected gear up, and depending on throttle setting, the pitch limits, surface deflections etc, may have contributed to a condition where the jet may suddenly have started sinking with the pilot unable to arrest the descent.