CJayArrgghh

Hello, After many years I've finally got the time to invest into ARMA 3, so I've started with the singleplayer campaign so I can get used to controls etc, the only other milsim I've played is a few hours of ARMA 2. My question is, I'm now up to the Signal Lost mission, which I'm assuming means I don't go back to Camp Maxwell. I didn't do any of the scouting or side missions from Camp Maxwell as I only just realised they were a thing, can I just go back and load one of the previous Camp Maxwell missions without losing my progress so I can do the scouting/side missions?