John Kendall is friendly, yet tough and no-nonsense. While he's not actively sinister, he'll follow orders without putting much thought into it. Introspection is not a trait he commonly displays. He loves being a cop and whether what he's doing is right does not worry him; he is the law.
During the Lone Wanderer's tenth birthday party on July 13, 2268, Officer Kendall can be overheard talking with the Overseer in the stairway to the Upper Level. Officer Kendall is assigned by the Overseer to give the party just a few more minutes and then make sure everyone gets back to work.
Escape!: The Lone Wanderer encounters Kendall just outside his or her room, where the officer is being attacked by several radroaches. The player can wait and hope the radroaches kill him, attempt to save him from the radroaches, or kill him. He is the first person that can be killed in the game. He will become hostile after the radroaches are dead.
Trouble on the Homefront: Officer Kendall will be present if he didn't die during Escape!. When interacted with, he blames the Lone Wanderer and James for the Vault's problems.