In the early 1950s the airport was served by the original Frontier Airlines (1950-1986) which flew DC-3's on a route from El Paso to Phoenix that included stops at Las Cruces, Deming, and Lordsburg, NM as well as Clifton, Safford, and Tucson, AZ.
A protected group is a group of people qualified for special protection by a law, policy, or similar authority. In the United States, the term is frequently used in connection with employees and employment.
You can define Restricted groups policies to manage and enforce the membership of built-in or user-defined groups that have special rights and permissions. Restricted Groups policies contain a list of members of specific groups whose membership are defined centrally as part of the security policy.