I wonder why they chose Phalanx instead of Goalkeeper? Topweight / Space / Deck penetration issues?
The only time Phalanx has ever been fired in anger against an incoming missile it managed to lock onto the Missouri and put a few dents in her armour plate. Gloucester took the kill with a Seadart.
In trials against a supersonic Vampire the Phalanx test rig and barge was destroyed despite getting a few rounds on target by the debris from the (much smaller than a Sunburn) missile. This was considered to be a successful test.....