Any flying job in the Reserves is difficult to get. Just do the math. Not many squadrons and lots of guys off active duty wanting to join them. Another factor is compatibility. Trying to get into a Reserve squadron is often refered to as "rushing the squadron". That is accurate, but not because it is some popularity contest. In the Reserves you don't get ordered in and out of a unit every 2-3 years. A JO joining a Reserve unit might be there until he is a senior O-4 or makes O-5. That could be 5-8 years. I spent 4 years in my Reserve squadron and only left when it was decomed. Was in my next Reserve unit for 5 years and was forced out when I made O-5. As you can see, having to tolerate a major tool or tactical incompetent for years without any releif is a threat to the wardroom. Having a great fleet reputation for airmanship, dependabiltiy, and personality is necessary. You then have to convice the squadron CO and wardroom that you are all that you think you are. The bottom line is that you have to really work at getting a Reserve flying job, adversary or otherwise.