Randolph James “Komrade” Bresnik (also known as Randy “Komrade” Bresnik, born September 11, 1967) is an officer in the United States Marine Corps and a NASA astronaut. He has logged more than 6,000 hours on 81 different aircraft.
He was selected by NASA in May 2004 as an astronaut candidate. He was one of two pilots chosen in the Astronaut Class of 2004. In February 2006, he completed Astronaut Candidate Training. Bresnik participated in the first analogue ESA CAVES mission on September 2011, staying underground and exploring the caves for 6 days, simulating Mars mission technologies.
On June 10, 2014, NASA announced that Bresnik would command the NEEMO 19 undersea exploration mission aboard the Aquarius underwater laboratory, which began on September 7, 2014 and lasted seven days.
Bresnik launched aboard Soyuz MS-05 to the ISS on 28 July 2017, and served as Flight Engineer for Expedition 52, and as ISS Commander for Expedition 53.
On October 5, 2017, Bresnik performed his third spacewalk, along with Mark Vande Hei. The spacewalk replaced the gripping mechanism on Canadarm2, the latching end effector A, or LEE-A. Spacewalk duration was 6 hours and 55 minutes. On October 10, 2017, Bresnik and Vande Hei completed the second EVA of the mission. They lubricated the newly installed end effector and replaced cameras, and the duration was 6 hours and 26 minutes. On October 20, 2017, Bresnik and Joe Acaba performed an EVA to continue with the lubrication tasks, and to install more cameras. The duration was 6 hours and 49 minutes.
Bresnik returned to Earth on December 14, 2017. The Soyuz MS-05 landed on 8:38 UTC. The duration of the mission was 138 days, 16 hours, 56 minutes and 37 seconds.