UNIT soldier (The Ambassadors of Death)

This UNIT soldier was a member of the UNIT security detachment to the British Space Centre. He served as a guard at the complex's main gate. He was attacked by one of the aliens who was trying to break into the British Space Centre. Miraculously, he survived the usually fatal effects of the aliens' blasts and was later seen back on duty. (TV: The Ambassadors of Death)

Behind the scenes
The UNIT soldier was played by Max Faulkner, who later played Corporal Adams in The Android Invasion. They are unlikely to be the same character, however, since Faulkner's character in Ambassadors appears to be killed by one of the alien ambassadors.