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Located deep in the Nevada desert, Area 51 is a highly classified US Air Force facility long rumored to house crashed UFOs and extraterrestrial technology.
As a new security intern, you must finalize the base handbook, but the automated translation software has glitched, creating dangerous grammatical errors in our safety protocols. Your mission is to identify the errors in the sentences below and rewrite each sentence perfectly.
Be alert, as each sentence contains a maximum of two mistakes. Make sure you start a sentence with a capital letter and do not forget the punctuation. All mistakes are related to the use of the modal verb "must".
 
Part 1: Security Clearances
You must keepings the hangar doors locked at all times.
 
Part 2: Access Requests
Does she must wear the mind-shielding helmet today?
 
Part 3: Danger Zones
He not must enters the restricted zone without a mask.
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