What is "j-catch"

J-CATCH, short for Joint Countering Attack Helicopter, was a joint US Army- US Air Force experiment in dissimilar air combat between jet fighters and attack helicopters. To the surprise of many involved in the program, the helicopters proved extremely dangerous to the fighters when they were properly employed, racking up a 5-to-1 kill ratio over the fighters when fighting at close ranges with guns. The lesson was that fixed-wing aircraft should not attack helicopters except at long range and/or high altitudes with long range missiles. This was worrying for forces based primarily on fixed-wing assets, leading to several design studies for helicopter-hunting aircraft.