A Rapid Intervention Team/Crew (RIT/RIC), is a team of two or more firefighters dedicated solely to the search and rescue of other firefighters in distress. RIT shall have no other operational assignment during an incident. Multiple alarm fires may require multiple RIT teams.

Through the late 1960s and early 1970s the London Fire Brigade introduced RIT procedures using EATL (Emergency Air Transfer Lines) and EASE (Emergency Air Supply Equipment). This consisted of designated firefighter search and rescue teams (termed "emergency crews") stationed at self-contained breathing apparatus (SCBA) control entry points, equipped with emergency SCBA specifically designed to be worn by unconscious, injured or trapped firefighters.

The National Fire Protection Association (NFPA) and the United States Occupational Safety and Health Administration (OSHA) have requirements for some type of RIT at structure fires. These standards require that a minimum of two fire fighters be standing by in full personal protective equipment while other crew members are working in a hazardous atmosphere. The standards are the result of a series of incidents where fire fighters became lost, trapped, or disoriented while fighting a structure fire without a RIT present.

The RIT concept is not universal, with many fire protection agencies training all personnel in rescue duties. Rescue teams are then designated based on apparatus order in the dispatch to a call in which standard operating procedures (SOPs) require that rescue teams be held at entry points. This is the basic concept of the "two-in, two-out" rule.

Note: While all of these versions of the name for a firefighter rescue crew either have been used or continue to be used in several areas, the National Incident Management System (NIMS) has determined that Rapid Intervention Crew, "RIC" will be the standard term. Currently, U.S. federally required training programs, from DHS and FEMA, are in the process of standardizing many terms and procedures under NIMS.

RIT equipment:
RIT members are normally equipped with some or all of the following:
Full turnout gear
Self-contained breathing apparatus (SCBA)
Personal alert safety system (PASS device)
Portable radio that uses the fireground frequency and is available to the incident commander
Hand tools
Hand light
Search rope or webbing
Rapid air transport (RAT) bag which slips over an SCBA bottle and holds an extra mask to tap into the bottle to provide a downed firefighter with air. This so-called RIT Bag was invented by Darrin Shaw, a firefighter with Central Pierce Fire and Rescue. The term 'RIT Bag' is now widely used, but the trademark stays with RIT.

The Keystone Valley Fire Department has four units set up for RIT responses. The main RIT response unit is Ladder 8 and/or Rescue 8, each has a specific set up on the unit for RIT. Rescue 8 is the secondary unit which is utilized in Chester and Lancaster on RIT requests for mutual aid alarms.

The County 9-1-1 Center automatically dispatches and assigns a RIT to every confirmed structure fire based on protocols established by the fire chief.

Engine 8-1 and Engine 8-2 are also set up with RIT equipment and available when needed as a Rapid Intervention piece.