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The SA-7 GRAIL or Strela-2 (стрела - arrow) is a man-portable, shoulder-fired, low-altitude surface-to-air missile (SAM) system similar to the US Army REDEYE, with a high explosive warhead and passive infrared homing guidance. The SA-7 was the first generation of Soviet man portable SAMs, introduced in the 1960s. Although the SA-7 is limited in range, speed, and altitude, it forces enemy pilots to fly above minimum radar limitations which results in detection and vulnerability to air defence systems. The SA-7 is a tail-chase missile system and its effectiveness depends on its ability to lock onto the heat source of low-flying fixed and rotary-wing aircraft.

See also: anti-aircraft, anti-aircraft missile, missile