In 1958, Pirnie was a successful
Republican candidate for the
United States House of Representatives. He served six terms, 1959 to 1973. While in Congress, Pirnie was the ranking Republican member of the subcommittee that oversaw the
1969 draft for the
Vietnam War. In this capacity he drew the first of the 366 capsules used to determine draft eligibility. (The capsules contained birth dates from January 1 to December 31, including February 29, and individuals born on those days were subject to the draft based on the order in which their birth dates were drawn. The first capsule contained the date September 14, so those born on September 14 were assigned draft number 1. The last capsule drawn was June 8, and those born on that date were assigned draft number 366.) Pirnie was a member of the
Inter-Parliamentary Union from 1965 to 1982. From 1964 until Pirnie's retirement,
Sherwood Boehlert served on his Congressional staff. Boehlert later served as
Oneida County Executive, and was a Member of Congress from 1983 to 2007. ==Post political career==