Granted, I did Canadian boot camp, and the cafeteria had plenty of low carb options. MRE's a pain in the arse, but if you're not overseas, but I was able to survive by keeping nuts, jerky, and other lowcarb-room temp stable foods handy in the field, and eating less of the high carb stuff.

Far as I understand it, ketosis occurs after the carbs are used- including the glycogen stores. I would think that while one starting a low carb diet tends to take a few days to get into ketosis, one could speed up their arrival in ketosis by simply doing some super intense carb burning exercising while still eating low car.

It would be a matter of finding your own personal balance. Trial and error for a while unfortunately.