Master Sgt. Richard Jordan, 562nd Combat Sustainment Group, oversees Edward Mulford calibrating a base-reference standard. All Air Force equipment must maintain tracability to the National Institute of Standards and Technology; base-reference standards are vital in the chain of traceability because they are used as standards to calibrate Air Force test, measurement and diagnostic equipment. (U.S. Air Force photo/Tech. Sgt. Kevin Wallace)
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.