Ken Mattingly Completes The Trans-Earth Coast EVA (25 April 1972) — Astronaut Thomas K. Mattingly II, command module pilot, performs an extravehicular activity (EVA) during the Apollo 16 trans-Earth coast. Mattingly is assisted by astronaut Charles M. Duke Jr., lunar module pilot. Mattingly inspected the SIM Bay or Service Module (SM), and retrieved film from the Mapping and Panoramic Cameras. Mattingly is wearing the helmet of astronaut John W. Young, commander. The helmet’s lunar EVA visor assembly helped protect Mattingly’s eyes from the bright sun. This view is a frame from motion picture film exposed by a 16mm Maurer camera.