What does RC stand for?

Runtime Configuration (unix/linux configuration files)

resistance–capacitance

Resident Coordinator

Runtime Command

Runlevel Control

Run and Compile

Rating and Certification

Rudy's Cellular

Recruiting Centre

Reserve Component

The Armed Forces of the United States Reserve Component consists of the Army National Guard of the United States, the Army Reserve, the Navy Reserve, the Marine Corps Reserve, the Air National Guard of the United States, the Air Force Reserve, and the Coast Guard Reserve.