He was trained at the Imperial Academy as a fighter pilot, but during one of his missions as a TIE Bomber pilot, he discovered the true nature of the Galactic Empire's ideals. He was ordered to bomb his home planet. He simulated a failure in his Bomber and aborted the mission. He managed to escape the Imperials and joined the Rebel Alliance. Jon got the nickname "Dutch" from his Rebel friends. He became Gold Leader and was assigned to a Y-wing, flying several campaigns for the Alliance with Gold Squadron.
During the Rebel Pilot Briefing by Jan Dodonna Vander interrupted him by asking "Pardon me for asking sir. But what good are snub fighters going to be against that?" and then later gave PrincessLeia a look of concern when Dodonna mentioned that the exhaust port was only two meters wide.
During the Battle of Yavin, he was one of the first groups who flew into the Death Star trench. Vander was on point, followed by Tiree (Gold Two) and Davish Krail (Gold Five), who formed a buffer against enemy fighters. Vander chose an extremely close formation for his pilots; this is typical for the much faster TIE Fighters, but the veteran Krail believed this to be a mistake. As Tiree was locking his target computer, Darth Vader shot him down. This caused Vander to panic; Krail tried to keep Vander calm but to no avail. A second later Vader fired into Vander's Y-wing, killing him instantly.