Sounds good but please don't fall into the trap of having unskippable cutscenes at the start of every mission. It gets rather annoying by the 3rd or 4th time you're replaying a failed mission. It's not hard to make cutscenes automatically skip after a certain number of plays.
This won't be a problem, because the cutscene is a completely separate mission that is marked as completed when it is played through the first time. Then the launching mission loads, where the player sees the main briefing. They launch from the carrier, and then warp out, and then the actual action mission loads, using the Red Alert/No Briefing settings. This gives the appearance of launching from the carrier and conducting operations in another area.
If anyone ever played the Wing Commander: Prophecy PC game, I'm going for that kind of feel. Briefing, launch, jump to mission. In fact, that's why the carrier is named the Midway... it's a subtle tribute to one of my all-time favorite games

... However, by typing that explanation, I just discovered a bug.... once the player does the launching mission, it'll be marked as completed and it won't come up again. So if they fail the action mission, they won't get to see the briefing or weapon loadout screen again. When they replay, it'll immediately drop them into the action mission
I might have to rethink my plan. Thanks for pointing that out, I wouldn't have realized that until later.