Unfortunately, Paladin Vargas, whose job is to train initiates and steer them away from heavy fighting, has failed in this responsibility. His oversight has recently resulted in an attack on a group of Brotherhood of Steel Initiates. Initiate Jennings bore the full brunt of a super mutant attack, and recently succumbed to the wounds.
If you resurrect Jennings through console commands on the PC he will proceed to the Rivet City market. When you speak to him he will say "Hello" and the only thing you can say to him is "I have to go now" where he will end the conversation with "Goodbye". This is due to the fact that Jennings is given the A.I. packages of Harkness, something that shouldn't matter in the normal game anyway because he will always appear dead.
The energy cells found beside his body are strangely larger than average ones.