Military reserves discrimination..?

I have been with my civilian job for 4 years now. Recently I enlisted with the National Guard. In the past I have often had "meets satisfactory" performance scores....all of a sudden after enlisting (and with a very new manager), I received a below average score and have been put on a rather harsh '90 day action plan' to improve on such things as: sounding monotone over the radio (I work in security, we use radios and I don't believe that I sound monotone) and other very minor BS excuses. Trust me it's all ridiculous BS. They know I am leaving for Basic training in less than two months. Does it seem like they are trying to pull a bunch of BS excuses to fire me before I leave for basic?