”RCS” Note: For most spacecraft, the system for controlling attitude in space is called the Reaction Control System, or RCS. (Thrusters create an action to produce a spacecraft reaction.)
In Gemini, this system was called the Orbital Attitude and Maneuvering System (OAMS). The system used during Gemini reentry (after the adapter section with the OAMS had been discarded) was
called the Reentry Control System, also abbreviated RCS.