Has anybody ever heard of an employer paying full wages while going on Active duty for an indefinite period of time?

Has anybody ever heard of a non-profit hospital paying full wages while going on Active duty for an indefinate amount of time in Texas or any state? Just curious my employers stated this was the case even if I'll be active duty for years(s). I won't know more details until I submit my orders 30 days prior to leaving. I've heard of reservists activated ro active duty getting full pay in addition to military pay but I thought this was a myth.