spotter
n.— «Cal Fire blamed the delay on a shortage of military helicopter managers, better known as spotters—trained wild-land firefighters who help military pilots position water drops and communicate with firefighters in the air and on the ground.» —“ Grounded military helicopters blamed on lack of ‘spotters’” by Tony Manolatos Union-Tribune (San Diego, California) Nov. 3, 2007. (source: Double-Tongued Dictionary)
Further reading
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