The Air and Space Training Ribbon (ASTR) is the lowest military award of the United States Air Force and United States Space Force, ranking only above foreign military awards.

USAF or USSF enlisted personnel who initially accessed through BMT who later complete USAF or USSF officer accession training (i.e., OTS, AFROTC, USAFA and so forth) are entitled to a subsequent award denoted by a bronze oak leaf cluster.

The ribbon is prohibited on all USN and USCG uniforms worn by former USAF or USSF personnel.

The United States Marine Corps does not have an equivalent ribbon, but instead awards their trademark Eagle, Globe & Anchor insignia upon completion of Recruit Training or Officer Candidate School, or at commissioning for those Marine Corps officers accessed via the United States Naval Academy (USNA), Naval ROTC (NROTC) Marine Corps Option or USMC Platoon Leaders Class (PLC).

Like the Navy and the Coast Guard, wear of the Air and Space Training Ribbon is also prohibited on all USMC uniforms worn by former USAF or USSF personnel.