SA-7, by Brian W. McMullin, undated. The SA-7 Strela-2 (NATO name: GRAIL) is a portable, shoulder-fired, low-altitude surface-to-air missile system that uses heat-detection technology to strike a target. First developed by the Red Army in 1967, the SA-7’s relatively low cost of production makes it a popular weapon around the world. The painting depicts a Polish version of the SA-7 with a Radio Frequency direction finder on the gunner’s helmet.