As long as you are not becoming an MSEOP to only drive tractor trailer, many guys spend their career trying to get over to that section and never do. You do rotate through the sections, heavy equipment, refueling, GPV (general purpose vehicles, mail runs, staff cars, VIP driving. Stuff like that) Army bases you won't see heavy or tractor, you'll see lots of field vehicles. I've been MSEOP for 22 years now and it's not bad. As with every trade there are people who like and those that don't. Once you hit MCpl you'll be driving a desk. I've been in tractor and your never home (same as civi), I did and still do like refueling sect. In heavy there is a lot of shift work mostly in the winter and that is another good section. How competitive is it? I'd say not really, it's like every other job. Do a good job and have a good attitude. You'll have good days and bad like everything else.