The SA-7 GRAIL or Strela-2 is a man-portable, shoulder-fired, low-altitude surface-to-air missile (SAM) system similar to the US ArmyREDEYE[?], 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.
... who are 65 years of age or older. The median age is 42 years. For every 100 females there are 126.2 males. For every 100 females age 18 and over, there are 120.4 ...