Charles Grey is an agent with R.I.R.
That is a highly secret organization inside the American Intelligence community. The acronym stands for "Reconnaissance, Intelligence, and Response". As Grey explains at the very beginning of the first recorded adventure, it handles "all the procedures of infiltration, deep penetration, intelligence gathering, data analysis and consequent response, based on all the former. Something that means each agent is let to infiltrate the area he is ordered to act into, carry out recon maneuvers, collect the needed and proper information and then undertake the proper response, even if this is termination or rescue. Within RIR, the term used for its agents, comes from the air-force jargon, the fighter jets and particularly for the fire-and-forget missiles used there. We are made of the same fire-and-forget material. Fire the missile, let it understand if it is a friendly or hostile target they have been aimed to, then and accordingly, follow the target's route, shoot it down as a hostile one, without the person who has fired that live missile, the RIR agent as a parallel, having to look on what is happening, or what the outcome will be."
This is not a behemoth of a government department. Besides the requisite support staff, its field agents consists of "15 Agents and 15 Controllers, one controller per agent". Each of those 15 agents are former Navy SEALs. Each has received additional training such that if there were specialized skills that different SEAL team members might have, all those skills would be taught to each RIR agent making each operative as capable as one can get.
Grey also lets us know that his callsign inside RIR was "Mr. Mission Impossible" after the television shows ans movies. "Usually, my maximum of solving a case, implementing the proposed response, was of two days."