How would you have a military reserve without USERRA?

Do you want twice as large of standing force? The "benefits" you speak of, should we just have it so if you make your skills available for the military (ones that you probably received on active duty) that your company can just fire you?

Shockingly... there are companies who just won't hire you if you are in the military reserves. That is their choice but the airlines have decided that the free training and employee that they get from the military is worth the "benefits" you speak of.