Below are what newly-winged Marines through various pipes will come out with if they pursue their FAA commercial certificate (you're a fool if you don't, it will never be less costly. The ratings are pulled directly from the FAA website certificate info of several Marines of my acquaintance). The V-22 powered-lift won't come until after qualifying in the fleet aircraft. Harrier boys don't get multiengine far as I am aware now that the T-2 is gone. If a fighter guy wants an ATP, he's going to need to do some time in a multiengine multicrew airplane, either on his own dime or flying the general's G-5 or T-44s or whatever else he can lay hands on.
At this stage of the game, I'm in agreement with SASless, put your nose to the grindstone. Don't get your heart set on a pipe based upon what you might be doing in 20 years. You also still must manage to make it through PA, FORM, upper-stage RI, and so forth. SASless will never admit it, but he loved his Chinook (as an Army geezer, he was happy just to not be flying recips).
Study your butt off, ask questions, attend all the community briefs you can, go to fleet fly-ins and talk to every pilot you can. Make it a point to ask ALL your Marine IPs what community they're from. Most training squadrons have Fleet Flight Suit Fridays, where the IPs wear patches and such from their fleet squadrons. This is one reason why it's done.
You need to be careful about talking about life on the outside before you even have your wings. It tends to make the IPs suspicious of your motives and your focus on the goal that Uncle Sam is paying you to achieve. Take my word for it, I was one. The IPs do talk about you behind your back.
Ask the reservists in the squadron (those who work in commercial aviation... there will be some) about life on the outside, but you'll need to do that on your own time, not squadron time. You may be surprised to learn that the vast majority of them prefer their military flying, whatever that may be.
Long ago, an officer I admire a great deal advised me to "Never ask for a job you don't want." He never did, and was a happy guy and very successful. I took his advice.
Being ABLE to choose your pipe is a nice problem to have. If your grades aren't good enough, what you want won't matter (sometimes if your grades ARE good enough, what you want doesn't matter... friend of mine wanted Hercs, got 18s... other times, there are no strike slots when you select). There is also the small matter of some number of combat deployments between your winging and your final separation from the service you'll need to get past.
Also, life tends to get in your way for the next several decades starting about an hour after you get your wings.
A helo guy (you MAY be able to add a type rating, depending upon the type):
COMMERCIAL PILOT
AIRPLANE SINGLE ENGINE LAND (comes from the primary trainer)
ROTORCRAFT-HELICOPTER (comes from the advanced trainer)
INSTRUMENT AIRPLANE AND HELICOPTER (comes from both)
A F/A-18 guy (he did the T-2 back when, so this has probably changed to just the first and third lines):
COMMERCIAL PILOT
AIRPLANE SINGLE ENGINE LAND
AIRPLANE MULTIENGINE LAND LIMITED TO CENTER THRUST
INSTRUMENT AIRPLANE
Limits:
AIRPLANE MULTIENGINE VFR ONLY.
A Herc guy (You can add a L-100 type later):
COMMERCIAL PILOT
AIRPLANE SINGLE ENGINE LAND
AIRPLANE MULTIENGINE LAND
INSTRUMENT AIRPLANE
A V-22 guy:
COMMERCIAL PILOT
AIRPLANE SINGLE ENGINE LAND
ROTORCRAFT-HELICOPTER
POWERED-LIFT
INSTRUMENT AIRPLANE AND HELICOPTER
INSTRUMENT POWERED-LIFT