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: 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. The pilot and weapons officer (if it’s a two person crew) are far more valuable as a substantial force multiplier in the cockpit of a fighter than being a ground pounding grunt with a handgun. The training received for such events is called SERE Training: S urvival, E vasion, R esistance and E scape. Emphasis is on survival and evading confrontation or capture while working one’s way toward friendly territory. It’s about maintaining acute situational awareness of the Bad Guys trying to close in on you while using methodical stealth to work your way toward friendly territory.