James Arthur Lovell Jr. (born March 25, 1928) is a former NASA astronaut and a retired captain in the United States Navy, most famous as the commander of the Apollo 13 mission, which suffered a critical failure en route to the Moon but was brought back safely to Earth by the efforts of the crew and mission control.

Can we draw the following conclusion?
James Lovell Jr wasn't an admiral when he retired from the Navy.
Yes