In a key milestone, the indigenously developed Tapas-201 MALE (medium-altitude long-Endurance) unmanned aerial vehicle (UAV) is now ready for user evaluation trials, the Defence Research and Development Organisation (DRDO) said on Wednesday.In a key milestone, the indigenously developed Tapas-201 MALE (medium-altitude long-Endurance) unmanned aerial vehicle (UAV) is now ready for user evaluation trials, the Defence Research and Development Organisation (DRDO) said on Wednesday.