Which of the following is a disadvantage associated with UAS operations?

A significant disadvantage associated with UAS (Unmanned Aerial Systems) operations is the lack of authorization to operate in the National Airspace System (NAS). This is crucial, as operating within the NAS requires compliance with stringent regulations and guidelines established by the Federal Aviation Administration (FAA) and other aviation authorities. The restrictions on UAS operation within this airspace can limit operational flexibility and accessibility, significantly impacting mission capabilities. It often results in UAS operators needing special permissions or waivers, which can hinder timely responses to changing operational needs.

While some of the other options point to potential challenges in UAS operations, such as high operational costs or limited flight duration, these are not universally applicable or exclusive drawbacks of UAS technology. In particular, advancements in technology continuously address issues like flight duration and operational costs, making them less definitive disadvantages compared to the regulatory limitations posed by the authorization to operate in NAS.