Extract the answer to the following question from the movie plot. If the question isn't answerable, please output "Can't answer". Question: Who convinces the military officials to cancel the second strike? Title: WarGames Movie plot: During a surprise drill of a nuclear attack, many United States Air Force Strategic Missile Wing missileers prove unwilling to turn a required key to launch a missile strike. Such refusals convince John McKittrick (Dabney Coleman) and other systems engineers at NORAD that missile launch control centers must be automated, without human intervention. Control is given to a NORAD supercomputer, WOPR (War Operation Plan Response), programmed to continuously run military simulations and learn over time. David Lightman (Matthew Broderick) is a bright but unmotivated Seattle high school student and hacker. After receiving a failing grade in school, he uses his IMSAI 8080 microcomputer to hack into the district's computer system. He then changes his grade and does the same for his friend and classmate Jennifer Mack (Ally Sheedy). Later, while dialing every number in Sunnyvale, California to find a set of forthcoming computer games, a computer that does not identify itself intrigues David. On the computer he finds a list of games, starting with general strategy games like chess, checkers, backgammon, and poker and then progressing to titles like "Theaterwide Biotoxic and Chemical Warfare" and "Global Thermonuclear War", but cannot proceed further. Two hacker friends explain the concept of a backdoor password and suggest tracking down the Falken referenced in "Falken's Maze", the first game listed. David discovers that Stephen Falken is an early artificial intelligence researcher, and guesses correctly that his dead son's name "Joshua" is the backdoor password. David does not know that the Sunnyvale phone number connects to WOPR, or "Joshua", at Cheyenne Mountain Complex. He starts a game of Global Thermonuclear War, playing as the Soviet Union. The computer starts a simulation that briefly convinces the military personnel at NORAD that actual Soviet nuclear missiles are inbound. While they defuse the situation, Joshua nonetheless continues the simulation to trigger the scenario and win the game, as it does not...
Falken, David, and Jennifer