Suppose that several licensed amateurs are part of a volunteer search and rescue team. The team is normally licensed and carries equipment to communicate on a variety of public safety bands in VHF/UHF during missions and training, and we are allowed to use law enforcement bands as needed to coordinate with various agencies.
In the case that there is a technical or other issue with the communication equipment during a mission or training. Would the licensed amateur operators be legally allowed to do any of the following?
Communicate on ham bands for life/safety critical updates (I believe "YES"?)
Use ham bands for regular mission traffic and coordination that is not immediately life critical. (I suspect no?)
Tie up ham repeaters for the purposes of above. (Probably not and not without annoying them)
Use ham bands to test / inspect team equipment when not on mission/training. (I believe "Yes"?)