For anyone who's been in the military, it goes without saying that being in the Air Force and being in the Marine Corps are two very different ways of life. This extends from enlisted troops all the way to the pilots flying in the skies above any active battle space.
And it goes well beyond physical fitness standards.
In the Air Force, once a pilot is finished training, he or she is a full-fledged pilot, who still might train in other areas outside of their chosen aircraft, be it helicopters, fighters, bombers, etc. The investment the Air Force puts into training its officers to fly means those pilots are going to be flying as much as the USAF can safely force them to. As company-grade officers, they're pretty much going to live in the wild blue yonder. As they advance in rank and skill, however, they will slowly be moved to more administrative and management positions, staff jobs, or even instructors. If they want, they might even get a chance to chew some dirt as an air liaison officer.
The life of a Marine Corps officer is much, much different.
Anyone reading this site probably knows the saying "every Marine is a rifleman." That goes for Marine Corps officers, too. But USMC pilots must also graduate from the Marine Corps Basic Officers Course so they can learn to command platoons of Marine Corps riflemen – and that's before they ever become naval aviators.
It's important to know that Marine pilots are trained as all Marine Corps officers are trained and that they're also trained as all naval aviators are trained. They take the same training as infantry officers and as naval aviators. As if that wasn't enough work, the Marine Corps doesn't wait for officers of Marines to grow in rank before assigning them extra duties around the unit or a duty outside of flying altogether. This means the Marine directing close air support on the ground with you one day might be providing that top cover for you another day.
All that and they have to land on aircraft carriers too. Probably in the dark.