RSV is "scheduled" mostly 5 on two off and 6 on two off. The dirty little secret is that the scheduling department can actually move your days off with no advanced notice. To them, it isn't "Junior Manning"... so there is no premium pay for working your days off (this applies to reserves only).

It's a terrible policy, but it's due to the extremely poor contract. They don't do it all the time, but it does happen.