One way is to place a trigger around your guys Activated on BLUFOR present. You'll want to include some kind of blackout/fadein cutscene for the first few seconds to cover up the teleport into the CRRC however.
With a Nomex Fireteam named player, sl1, sl2, sl3 and the CRRC named ship, I put this as the OnAct of the trigger and it worked:
sl1 moveInCargo ship; sl2 moveInCargo ship; sl3 moveInCargo ship; player assignAsDriver ship; player moveInDriver ship;
The briefing came up, you saw your guys on the shore next to the CRRC, you were able to pick weapons for everyone. Once you pressed Continue it faded to black, a little loading message came up and when it faded back in we were all in the CRRC with the proper weapons as chosen within the briefing.