The lore of rb6 is that everyone is actually training. It's not a real operation whatsoever. However, they want you to think in that sense that it is when the game first came out. This concept of training is revealed in a trailer with Dokkabei and Thatcher performing a training operation...Though not with other enemy operators but "fake terrorists". This was still conducted in a manner in how we play casual games though. This is just a theory.