Acceptable IDs include:

U.S. passport
U.S. passport card
DHS "Trusted Traveler" cards (NEXUS, SENTRI, FAST)
U.S. Military ID (active duty or retired military and their dependents, and DOD civilians)
Permanent Resident Card
Border Crossing Card
DHS-designated enhanced driver's license
Drivers Licenses or other state photo identity cards issued by Department of Motor Vehicles (or equivalent)
A Native American Tribal Photo ID
An airline or airport-issued ID (if issued under a TSA-approved security plan)
A foreign government-issued passport
Canadian provincial driver's license or Indian and Northern Affairs Canada (INAC) card
Transportation Worker Identification Credential (TWIC)