Army G.I.s opposed to the Vietnam War at the Shelter Half Coffeehouse in Tacoma, Wash., in 1969.CreditJohn Bryson/The Life Picture Collection, via Getty Images.

This article originally appeared at the newyorktimes.com.

By David L. Parsons.

In the summer of 1967, Fred Gardner arrived in San Francisco with the Vietnam War weighing heavily on his mind. Gardner was 25 years old, a Harvard graduate and a freelance journalist for a number of major publications. He was attracted to Northern California’s mix of counterculture and radical politics, and hoped to become more actively involved in the movement to end the war. He was particularly interested in the revolutionary potential of American servicemen and couldn’t understand why antiwar activists and organizers weren’t paying more attention to such a powerful group of potential allies.

Ever since completing a two-year stint in the Army Reserves in 1965, Gardner had been closely watching the increasing instances of military insubordination, resistance and outright refusal that were accompanying the war’s escalation. From the case of the Fort Hood Three — G.I.s arrested in 1966 for publicly declaring their opposition to the war and refusal to deploy — to the case of Howard Levy, an Army dermatologist who refused his assignment to provide medical training for Special Forces troops headed to Vietnam, it was clear that the Army was fast becoming the central site of an unprecedented uprising. By 1967, the “G.I. movement” was capturing national headlines.

And it wasn’t just the war that was aggravating American servicemen. The military’s pervasive racial discrimination — unequal opportunities for promotion, unfair housing practices, persistent harassment and abuse — fueled increasing outrage among black G.I.s as the war progressed. Influenced by the civil rights and black liberation movements, black soldiers participated in widespread and diverse acts of resistance throughout the Vietnam era. Racial tensions were particularly high in the Army, where a vast majority of draftees were being sent, and where evasion, desertion and insubordination rates among black G.I.s exploded in the war’s later years. An antiwar movement in the military was beginning to take shape, with black soldiers often its vanguard.

Antiwar veterans protest at the Federal Building in Seattle, September 1968. Credit Fred Lonidier