American experimental spaceplane X-37B completed its 780-day mission in earth orbit and 27 October, successfully landed at Cape Canaveral in Florida.
As specified on the website of the U.S. air force, this mission is the fifth since 2010. The last time the secret apparatus carried in space 718 days. The sixth mission is scheduled for 2020.
According to the head of Roscosmos, Dmitry Rogozin, this hook is used for placing weapons in space.