Oleg Zabluda's blog
Tuesday, October 11, 2016
 
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The Air Force launched a fourth X-37B mission, designated OTV-4 and codenamed AFSPC-5, aboard an Atlas V rocket from Cape Canaveral Air Force Station on 20 May 2015. The launch was designated USA-261 and is the second flight of the second X-37B vehicle. The mission will test a Hall effect thruster in support of the Advanced Extremely High Frequency communications satellite program, and conduct a NASA investigation for testing various materials in space.[4][21][44]
"""
https://en.wikipedia.org/wiki/Boeing_X-37#OTV-4
https://en.wikipedia.org/wiki/Boeing_X-37#OTV-4

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