Title: Do fighter-jet pilots carry guns in case they have to eject or land in enemy territory? If so, what type of guns do they have? Does the weapon carried change according to the mission? - Quora
Headings: 
Marines carry a Kabar knife and a 9mm semi-automatic.
Content: We never counted on it; if we had it we were lucky. Getting some distance between yourself and the wreckage, and not leaving a trail of boot prints, was the first urgent goal. That’s where all the Bad Dudes with bang sticks are going to head for. With a crew and one or two lightly armed passengers, all with pistols, starting a firefight with dozens of Angry Dudes looking for you with bang sticks would be ill-advised. It can quickly turn a Bad Day into a Very Bad Day. [ Cue the scene from Thin Red Line near the end when Pvt. Witt is surrounded by a dozen or so Japanese.] One or two crew members from the hypothetical fixed wing fighter aircraft have an even greater disadvantage, especially during the day, when everyone can see the parachute (s) slowly descending. After a crash, the primary mission isn’t playing infantry fire team on the attack and initiating a firefight, it’s getting back to friendly forces to resume one’s Day Job.