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Grant is a long time NCRranger, best described as the "shoot first, never ask questions" type of soldier, someone who doesn't mind going into combat, so long as his soldiers shoot alongside him. He was injured at one point, which may explain his aggressive nature. He also seems to enjoy and even volunteer for more dangerous missions.
Despite wearing his eyepatch on his right eye, when he takes aim he uses that eye. This is due to the aiming animation being only for right-handed characters.
At some point during development, Grant was instead an NCR Captain by the name of Graham. References to this name still exist, notably in his GECK Editor ID: VHDCaptainGraham.
xbox360ps3 If you inform Ranger Grant in person after killing the Legion Sniper on the tower during the quest You'll Know When it Happens, or if you choose the "goodbye" conversation option before the quest, he will sound as if he is talking to you through a radio even though you are standing in front of him. [verified]
pc Another unknown bug is when you talk to him during the quest You'll Know When it Happens the only available conversation option is "goodbye". [verified]
pc Sometimes he says that they're preparing to protect the president, and the only dialogue option is "Goodbye". To fix this, reset Ranger Grant by typing prid 0013721F then disable and last enable. [verified]