This guy was not recruited by the CIA, he was a walk-in who volunteered to spy for the United States in 2012.
The 19-year-old Jou, an aspiring doctor, often tutored and volunteered at charities around her Rancho Santa Margarita home.
He volunteered to be part of an eight-man squad that set out to silence some enemy mortars.
c.1600, "one who offers himself for military service," from Middle French voluntaire, noun use of adj. meaning "voluntary," from Latin voluntarius "voluntary, of one's free will" (see voluntary). Non-military sense is first recorded 1630s. The verb is first recorded 1755, from the noun. Tennessee has been the Volunteer State since the Mexican War, when a call for 2,800 volunteers brought out 30,000 men.