At their farm, called Archi’s Acres, the sound of crickets and croaking frogs communes with the drone of choppers. The syllabus, approved by Camp Pendleton’s transition assistance program, includes hands-on planting and irrigating, lectures about “high-value niche markets” and production of a business plan that is assessed by food professionals and business professors.

Along with Combat Boots to Cowboy Boots, a new program for veterans at the University of Nebraska’s College of Technical Agriculture, and farming fellowships for wounded soldiers, the six-week course offered here is part of a nascent “veteran-centric” farming movement. Its goal is to bring the energy of young soldiers re-entering civilian life to the aging farm population of rural America. Half of all farmers are likely to retire in the next decade, according to the Agriculture Department.

“The military is not for the faint of heart, and farming isn’t either,” said Michael O’Gorman, an organic farmer who founded the nonprofit Farmer-Veteran Coalition, which supports sustainable-agriculture training. “There are eight times as many farmers over age 65 as under. There is a tremendous need for young farmers, and a big wave of young people inspired to go into the service who are coming home.”

About 45 percent of the military comes from rural communities, compared with one-sixth of the total population, according to the Carsey Institute at the University of New Hampshire. In 2009, the Agriculture Department began offering low-interest loans in its campaign to add 100,000 farmers to the nation’s ranks each year.

Among them will probably be Sgt. Matt Holzmann, 33, a Marine at Camp Pendleton who spent seven months in Afghanistan. He did counterinsurgency work and tried to introduce aquaponics, a self-replenishing agricultural system, to rural villages.