Government auditors have determined the Navy has valid requirements and a solid acquisition approach for the new MQ-25 Stingray, and revealed the unmanned aerial system has a $5 billion cost ceiling. Inside the Navy previously reported the Navy plans to spend $2.3 billion through fiscal year 2022. The service now anticipates spending $2.5 billion in that time frame, according to a Sept 6. Government Accountability Office report, but auditors added "the Navy does not expect total development cost to exceed...