sentences:  From 1959 to 1968, the 137th Air Defense Artillery Regiment was part of the force.2-137 & 3-137 served with 371 AGAD from 1 September 1959 to 1 February 1968, which 1-137 served with the 137 AGAD, until 1 April 1963, and then transferred to the 371 AGAD, 1 April 1963, to 1 February 1972.With the escalation of the Vietnam War, the Ohio Guard was again called upon to engage in combat upon foreign shores.