Aug. 26 through Sept. 2, 1951 - During the Korean War, the 15th Field Artillery Battalion was in support of 2d Infantry Division during the battle of Heartbreak Ridge. The battalion set their second record of the war and fired 69,956 rounds of 105mm artillery shells during the battle.
1957 - The Soviet Union announced that it successfully tested an intercontinental ballistic missile (ICBM) capable of being fired “into any part of the world.”
1960 - The 5th Field Artillery was consolidated with Headquarters and Headquarters Battery, 5th Artillery Group, 24th Antiaircraft Artillery Missile Battalion, and the 1st Battalion, 5th Coast Artillery and re-designated as the 5th Artillery.
1969 - In the Vietnam War, the 3rd Battalion, 197th Artillery of the New Hampshire National Guard suffered its' highest loss of life when a truck was blown up by a landmine and seven Guardsmen killed. The unit was scheduled to return home from Vietnam in less than two weeks.
A bronze plaque stands in front of the Manchester, N.H. armory in their memory.