Drone Round announced today that its 5.56x45mm L Variant counter-UAS cartridge has been integrated into the Indoor Simulated Marksmanship Trainer (ISMT), the U.S. Marine Corps virtual small arms training system produced by InVeris. The integration gives Marines a way to build engagement skills with the multi-projectile round on the same simulators already installed at bases across the Corps, timed to the arrival of the first live deliveries.