According to the MDA:
The Airborne Laser (ABL) research and development platform successfully fired the onboard High Energy Laser (HEL) to engage an instrumented target missile, called a Missile Alternative Range Target Instrument (MARTI). This test demonstrated the full functionality of the ABL system to successfully acquire, track, and engage a boosting target. Test instrumentation aboard the MARTI collected data to evaluate ABL laser system performance. This test engagement was not intended to lethally destroy the missile.
The MARTI test rocket was launched from San Nicolas Island off the central Californian coast, which lies within a US naval firing range used for the test. According to the MDA the trial raying earlier this month provided data which will assist with the first attempt to actually destroy a missile, now set to take place sometime this year.
ABL programme chiefs had previously spoken of full-on destruction tests taking place last year, so it’s clear that flight testing of the mighty raygun hasn’t gone as smoothly as hoped.