Donald C. Lammers of Greenlawn, a retired school administrator and enthusiastic American Legion volunteer, died of pneumonia at his home on Aug. 17.

He was 85.

Lammers served in the U.S. Army in the 1950s, and in later life was a familiar sight at parades in his community, where he was a frequent flag bearer. He was a longtime member of American Legion Post 1244 in Greenlawn and served for years as the post’s sergeant-at-arms.

“One thing about Don, he always liked to count cadence . . . left . . . right . . . left,” said Bob Santos, who was commander of Post 1244 from 2005 to 2015.

Born Nov. 28, 1930, in Queens, Lammers attended Catholic schools in the borough. After graduating, he earned his bachelor’s degree in education at SUNY Cortland.

He joined the Army toward the end of the Korean War and served with the military police at Fort Benning, Georgia. A strong swimmer, he spent much of his time on post teaching South Korean officers how to swim, according to a family member.

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In the mid-1950s, Lammers moved to Nassau County. He taught elementary classes in East Meadow, and also commuted to Columbia University in Manhattan to earn his master’s degree in education.

After 17 years in East Meadow, he held a series of school administrative jobs in Greenburgh in Westchester County, and in Long Beach and other communities. He later worked more than a dozen years in inventory at the state Supreme Court office in Riverhead.

Lammers and his family moved from Plainview to Greenlawn in 1969. He served as a commissioner for the Greenlawn Water District and was a longtime volunteer with the local Little League in which his children played baseball.

“I think family was the most important to him,” said Eileen Lammers, his wife of more than 50 years and a former teacher in Lynbrook and Harborfields.

In addition to his wife, Lammers is survived by his daughter, Colleen Nick of Shelburne, Vermont; and sons, Kevin Lammers of Greenlawn, Sean Lammers of Long Island City, Queens, and Brian Lammers of Hartford, Connecticut. He also leaves two brothers, Brian Lammers, also of Hartford, and Gerald Lammers of Blanchard, Idaho; and a sister, Diane Bancanello of Garden City.

A funeral Mass was celebrated Monday at St. Francis of Assisi Roman Catholic Church in Greenlawn, followed by burial in Calverton National Cemetery.