Do I need a passport or valid GC if traveling within the U.S or U.S. territories?

While these documents are not required the Transportation Security Administration does state, adult passengers 18 and over must show valid identification at the airport checkpoint in order to travel. TO AGENTS: These are examples you may provide as acceptable IDs for screening purposes: U.S. passport U.S. passport card DHS trusted traveler cards (Global Entry, 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 Driver's licenses or other state photo identity cards issued by Department of Motor Vehicles or the sole purpose of identification Federally recognized, tribal-issued photo ID HSPD-12 PIV card Airline or airport-issued ID (if issued under a TSA-approved security plan) Foreign government-issued passport Canadian provincial driver's license or Indian and Northern Affairs Canada card Transportation Worker Identification Credential CITATION; http://www.tsa.gov/traveler-information/acceptable-ids https://help.cbp.gov/app/answers/detail/a_id/980/~/needing-a-passport-to-enter-the-united-states-from-u.s.-territories