Which Apollo mission was completely manned by Navy personnel?

The Apollo 12 mission is notable for being the only Apollo mission to be entirely crewed by naval officers. This mission was launched on November 14, 1969, and included Commander Charles "Pete" Conrad, Command Module Pilot Richard F. Gordon, and Lunar Module Pilot Alan L. Bean, all of whom had backgrounds in the U.S. Navy.

The significance of this mission in the context of naval heritage is underscored by the fact that Apollo 12 successfully achieved the goal of lunar exploration, further solidifying the contributions of Navy personnel to the U.S. space program. The Apollo missions were pivotal in demonstrating the capability of NASA to conduct complex missions, and the participation of Navy personnel reflects the military's investment in technological advancements and exploration.

The other Apollo missions listed had crew members from various military branches, but Apollo 12 stands out specifically for its all-Navy crew, which highlights the significant role that Navy personnel played in the U.S. space endeavors.