One member emailed me that Army MARS is exclusively M110, so this will not be useful.
I think Air Force MARS permits MT63 after M110 fails, but nobody wants to do offline encryption anymore, so when M110 fails, nobody cares.
Personally, when I can't receive a message sent to the Net - and others have already asked for a retransmission, I do not bother to ask for a retransmission -? as more retransmissions will not help.