Functional laser weapons are just five years away. Advocates hope that won’t always be the case. The Air Force has been working on airborne laser weapons for more than 40 years, but a fielded system remains elusive. Experts also warn that the US does not enjoy a commanding lead in laser research. And the Air Force’s flagship laser weapon program, the Airborne Laser (later called the Airborne Laser Testbed) was terminated late last year and is now being dismantled. Still, service and industry experts predict there is plenty of reason for realistic optimism. Operational laser systems that can perform a...