The X-37B currently circling the Earth on the OTV-3 mission has been doing so now for over 650 days. Its launch marked the first occasion on which an OTV has ever been used for a second mission. It previously flew for 224 days in April-December 2010, and a sister ship flew the OTV-2 mission for 15 months from March 2011 until mid-June of 2012.
It is not known how long OTV-3 will remain in orbit, and its precise mission objectives remain heavily classified.
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