Further complications were added to the crisis by the placement of SA-2 missiles, the SA-2 a SAM or Surface-To-Air-Missile. These missiles had the ability to shoot down any aircraft, even the high flying U-2. When operational, these sites would pose a great danger to the photographic missions, necessary for the United States to keep informed on the crisis.<ref>http://www.nasm.si.edu/research/dsh/artifacts/RM-SA2.htm</ref> | Further complications were added to the crisis by the placement of SA-2 missiles, the SA-2 a SAM or Surface-To-Air-Missile. These missiles had the ability to shoot down any aircraft, even the high flying U-2. When operational, these sites would pose a great danger to the photographic missions, necessary for the United States to keep informed on the crisis.<ref>http://www.nasm.si.edu/research/dsh/artifacts/RM-SA2.htm</ref> |