Plot hole: McKittrick says the computer will not accept the launch codes unless they are at DEFCON 1. At the end of the climax the computer is trying to guess the code while they are at DEFCON 1. So why couldn't they just go back to a different DEFCON before the correct code was guessed?

WarGames (1983)
Ending / spoiler
Directed by: John Badham
Starring: Matthew Broderick, Dabney Coleman, John Wood, Ally Sheedy
The hacker gets the computer to stop blowing up the world by telling it to play tic-tac-toe so the computer will realize that there is no winner in a nuclear war.
Rob T Firefly
David Lightman: [On the computer] Hello, are you still playing the game?
Joshua: Of course. I should reach Defcon 1 and release my missiles in 28 hours. Would you like to see some projected kill ratios?
David Lightman: Sixty-nine percent of the housing destroyed. Seventy-two million people dead. [Types into computer] Is this a game or is it real?
Joshua: What's the difference?
Trivia: Closely listen to the TV playing in the background, when Mathew Broderick comes home from school, before all his trouble starts with the Feds. The local news is on, and is saying "a fire broke out in a prophylactic recycling factory."
Question: Since David told McKittrick that he thought he was only playing a game and at the time didn't know that he hacked into WOPR, McKittrick tells him that they're still on Defcon 4. Why would it still be on Defcon 4 instead of it going back to Defcon 5 after David confessed everything?
Answer: McKittrick doesn't believe David. He thinks he's covering for accomplices...most likely Russian spies.
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Answer: The assistant to McKitrict explains that US is waiting to go back on DEFCON once the Russians do so.