A workhorse for the Coast Guard from March 8, 1973 when delivered from Sikorsky until withdrawn and sold to Carson Helicopters in 2011 as N704WK. Carson sold it to the US Department of State a couple of months later as the government was buying up all the S-61s they could find for work overseas. Sold by auction in late 2016, the helicopter was registered to to Robertson Air Crane on March 18, 2017.