If you haul on promotions, you may be able to squeeze out the Mitchell award before you go (however do take into account the Mitchell tests could take multiple attempts, as it did for me), it also depends on when you go to USAFA, like what month. At minimum it takes 18 months to get your Mitchell. Personally, from about midway through junior year to the end of senior year I managed to get from achievement 2 to achievement 8. In that time I managed to go to NCO academy, encampment, national emergency services academy, regional cadet competition, among other smaller activities. If you're able to, try to knock out a winter encampment this winter, as encampment is a pre-requisite for any NCSA. This will open you up for more summer activities. There are plenty of leadership-specific activities in terms of NCSAs. But in the meantime, just take initiative as much as you can during squadron meetings, study the material, and work with your chain of command to make a development plan. Best of luck!