[2] After college graduation, Frank joined the United States Marine Corps for four years as a pilot, then served in the Reserve, becoming a lieutenant colonel.

[1] While working for the Glenn L. Martin Company in Baltimore, Maryland, Frank earned a master's degree in mechanical engineering at Drexel University in Philadelphia.

[2] Frank was one of 44 men selected to report to Brooks Air Force Base for two months for extensive medical testing in January and February 1966 during the recruitment of what would become NASA Astronaut Group 5.

[2] In his January 1999 oral history, flight director Gene Kranz said, "Pete Frank translated the values 'discipline, morale, tough and competent now' into a statement … each controller has an opportunity to reflect as he approaches his role and responsibility in each mission.

[5] Frank served on the internal review board to study the causes of the Apollo 13 onboard explosion, under Dr. Edgar Cortright, Director of the Langley Research Center.