He was assigned to the Office of Strategic Services at Fort Meade, Maryland and served in the Mediterranean Theater of Operations.

[citation needed] Daddario continued his military service in the Connecticut National Guard.

During the Korean War, he returned to active duty as a major with the Forty-third Division of the Connecticut National Guard in the Far East Liaison Group until 1952.

[citation needed] Daddario won election in 1958 to the Eighty-sixth Congress and served until January 3, 1971.

He ran unsuccessfully for Governor of Connecticut in 1970, losing the general election to Thomas J. Meskill.

[5] He died on July 7, 2010, from heart failure, according to his son, Richard, the New York Police Department's incoming deputy commissioner for counter-terrorism.