Official websites use .mil
Secure .mil websites use HTTPS
Staff Sgt. William Ensrud, aerospace physiology technician and assistant course director for aerospace and operational physiology apprentice course, listens to a student’s question during the course. (U.S. Air Force photo by Richard Eldridge)
No camera details available.
This photograph is considered public domain and has been cleared for release.
If you would like to republish please give the photographer appropriate credit.
Further, any commercial or non-commercial use of this photograph or any other
DoD image must be made in compliance with guidance found at
which pertains to intellectual property restrictions (e.g., copyright and
trademark, including the use of official emblems, insignia, names and slogans), warnings
regarding use of images of identifiable personnel, appearance of endorsement, and related matters.