From the If-You-Throw-Enough-Money-Around-It-Might-Eventually-Work department, the "Joint Land Attack Cruise Missile Defense Elevated Netted Sensor" (JLENS) is a shark with a frikkin' laser beam, er sorry, a large pair of radar blimps that provide high altitude, long range detection of enemy missiles. Yes, blimps - those big balloon things with fins that used to float over London in WWII to try and cause problems for attacking German aircraft. The JLENS blimps are much bigger, much, much more expensive, and have high-tech stuff in them. High tech stuff that has caused impressive cost overruns. Anyway, the JLENS did finally help to shoot down a test missile, so it's all good.