ERINT began in 1987 and  was a follow-on to the successful Flexible Light weight Agile Experiment (FLAGE) program.  The missile diameter was increased to 10 inches to extend the range and a small high-energy warhead was added to improve the kill capability against some of the difficult targets.  The kinetic kill capability of the Vought missile was proven  to be very effective in completely destroying incoming missiles equipped with deadly chemical warheads.  The four flight tests had three direct hits and one flight with a very small miss of the target.