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Preparing for launch

VANDENBERG AIR FORCE BASE, Calif. --  United Luanch Alliance workers position a solid rocket motor for emplacement on a Delta II rocket. The Delta II rocket will launch NASA's Wide-field Infrared Survey Explorer satellite, which will observe the entire sky in mid-infrared wavelengths with greater sensitivity than ever before. (Courtesy photo/Mark P. Mackley)

VANDENBERG AIR FORCE BASE, Calif. -- United Luanch Alliance workers position a solid rocket motor for emplacement on a Delta II rocket. The Delta II rocket will launch NASA's Wide-field Infrared Survey Explorer satellite, which will observe the entire sky in mid-infrared wavelengths with greater sensitivity than ever before. (Courtesy photo/Mark P. Mackley)

VANDENBERG AIR FORCE BASED, Calif. --  United Luanch Alliance workers lift a solid rocket motor for emplacement on a Delta II rocket. The Delta II rocket will launch NASA's Wide-field Infrared Survey Explorer satellite, which will observe the entire sky in mid-infrared wavelengths with greater sensitivity than ever before. (Courtesy photo/Mark P. Mackley)

VANDENBERG AIR FORCE BASED, Calif. -- United Luanch Alliance workers lift a solid rocket motor for emplacement on a Delta II rocket. The Delta II rocket will launch NASA's Wide-field Infrared Survey Explorer satellite, which will observe the entire sky in mid-infrared wavelengths with greater sensitivity than ever before. (Courtesy photo/Mark P. Mackley)

VANDENBERG AIR FORCE BASE, Calif. --  United Luanch Alliance workers place a solid rocket motor on a Delta II rocket. The Delta II rocket will launch NASA's Wide-field Infrared Survey Explorer satellite, which will observe the entire sky in mid-infrared wavelengths with greater sensitivity than ever before. (Courtesy photo/Mark P. Mackley)

VANDENBERG AIR FORCE BASE, Calif. -- United Luanch Alliance workers place a solid rocket motor on a Delta II rocket. The Delta II rocket will launch NASA's Wide-field Infrared Survey Explorer satellite, which will observe the entire sky in mid-infrared wavelengths with greater sensitivity than ever before. (Courtesy photo/Mark P. Mackley)