The tickets are not for sale. Go the museum's website to see the various ways to obtain entry.
Go online Monday to Friday at 6 am for Same day passes. You can also go the museum about Noon to line up for same day passes. You can also walk around and ask people in line if they have an extra pass. Law enforcement, military and first responders just show id and don't need passes for themselves and a guest. You should go to the museum website and sign up for email updates. The museum sometimes announces more passes for special dates or events.
You have to go on line. BUT they are sold out and the list reopens in March.
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