What rank did John H. Glenn hold when he orbited the Earth?

John H. Glenn held the rank of Lieutenant Colonel when he orbited the Earth. This rank is notable because it reflects his significant status as both a Marine Corps aviator and an astronaut during a pivotal time in the United States' space exploration efforts. In 1962, Glenn became the first American to orbit the Earth, flying in the Mercury-Atlas 6 spacecraft named Friendship 7. His position as a Lieutenant Colonel also underscores his extensive training and experience, which were crucial for the complex mission he undertook. The distinction of his rank adds to the historical context of his achievement, as it positioned him among other noteworthy military personnel who transitioned into space exploration roles, aligning with the era's blending of military and aeronautical advancements.