While on military leave for training you will continue to accrue seniority at your regional, and would likely return from mil leave to Captain school. Depending on your unit, you may get to fly some really cool aircraft.
You may also have some ability to moderate the more abusive airline scheduling practices.
I would only suggest that you take this step if you mentally commit to a twenty year career, which would entitle you to a military retirement at age 60.
Joe