Air Force Research Laboratory workers use a crane to remove a newly delivered Upper Stage Engine Technology turbo pump from its shipping crate. The USET turbo pump will be connected to AFRL's 2A rocket test stand, where it will undergo a series of tests using liquid hydrogen. (U.S. Air Force photo/Kenji Thuloweit)

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Photo by: Kenji Thuloweit |  VIRIN: 100908-F-3438T-001.JPG