
Previously referred to as the Stephenville Air Base, the site was officially named "Ernest Harmon Air Force Base" on June 23, 1941 in honour of Capt. Ernest Emery Harmon, a pioneer in United States military aviation history who had served with the U.S. Air Corps during the First World War.
Newfoundland was in debt and went through several delegations to determine whether the country would join Canada, remain under British rule or regain independence. The voting for the referendums occurred on June 3 . 1948.
On April 1, 1949, Prime Minister Louis St. Laurent cut the first ceremonial chisel strokes onto the blank stone. At 11:59 the previous night, Newfoundland had become a Canadian province.


In 1940, the town became host to the largest American Air Force Base outside the continental US. Under its Leased Bases Agreement with Britain, the United States had obtained rights to build the Stephenville air base in 1940.
After the war, the airfield continued to be used as a refueling point and on June 23, 1948 the base was renamed "Ernest Harmon Air Force Base" in honor of Captain Ernest Emery Harmon.
The voting for the referendums to become part of Canada occurred on June 3 . 1948. The cancel (duall ring) on this Scott 270 is dated June 2. 1948. Which makes it possibly the the LRD (Last Recorded Date) of this cancel before it became "Ernest Harmon Air Force Base" in June .1948 or very cloe to it.
Harmon Field postoffice
Postmaster – P. Ryan
Date – From 1943- 10-13 to 1949-04-18
