Collisions between birds and aircraft are problems that have been with us since the early days of powered flight. The majority of such occurrences cause slight damage which does not affect airworthiness of the aircraft, but others have caused structural problems and loss of control with catastrophic results to the aircraft and occupants. The bird strike threat is significantly greater in military aviation since the normal operational environment is at a much lower altitude than in the civil sphere, and it is here that most birds are found.