big voice
n.— «When there is an attack, a siren goes off that sounds like the air raid sirens in the movies. Then, there a speaker system we call “Big Voice” that directs everyone to “take cover.”» —“NGAC 1st VP’s Update: More News from Baghdad” by Chris Schnaubelt National Guard Association of California Jan. 28, 2004. (source: Double-Tongued Dictionary)