 In practice, shooting at a specific ground target is much trickier than flying over an area and taking pictures, and it wasn't until the 1970s that the US Air Force seriously experimented with the concept.The objective was to study an attack system to perform the dangerous "suppression of enemy air defenses (SEAD)" mission, or in other words to destroy enemy anti-aircraft gun and SAM sites.The project was known as HAVE LEMON.