Research scientist Dr. Steve Danczyk, Air Force Research Laboratory, shows Dr. David Walker, a liquid rocket engine test rig used to test individual rocket components prior to scaling them up and integrating them into a full-scale rocket engine. (U.S. Air Force photo/Kenji Thuloweit)

PHOTO BY: Kenji Thuloweit
VIRIN: 150924-F-IW159-006.JPG
FULL SIZE: 2.28 MB
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