Strategic Homeland, Intervention Enforcement, and Logistics Division.

Equipment: S.H.I.E.L.D. has used a wide variety of advanced vehicles, weapons and other equipment.

The S.H.I.E.L.D. Helicarrier is the agency's signature capital ship and headquarters.

The S.H.I.E.L.D. Flying Car is the standard issue S.H.I.E.L.D. vehicle.

The S.H.I.E.L.D. regulation issue sidearm was originally a .30-caliber rapid-fire machine pistol, later replaced by an advanced plasma-beam pistol. Nick Fury often carried his personal sidearm, the NF3000, a .15 caliber handgun, a weapon that fired explosive flechettes.

Organizational structure and procedure: Over the decades, various writers have depicted S.H.I.E.L.D.'s organizational structure in several different ways. The Official Handbook of the Marvel Universe (first edition) describes an eight-level ranking structure (technician, administrator, field agent, regional officer, special officer, regional director, special director, executive director), although providing almost no detail on other aspects of the Directorate's internal makeup. Years later, the miniseries Agents of Atlas mentioned a position of "sub director," and seemed to indicate that the administrative department of S.H.I.E.L.D. it itself referred to simply as "Directorate."

Most of S.H.I.E.L.D.'s agents are normal humans. At one point the organization attempted to set up a team of superhuman agents, composed of Marvel Man (the future Quasar), Texas Twister, Blue Streak and the Vamp but the latter two were secretly agents of the criminal organization The Corporation, and the team broke apart before it had its first official mission. A second team organized years later also lasted only a short while.

S.H.I.E.L.D. does employ some superhumans, including in its Psi-Division, composed of telepathic agents who deal with like menaces. S.H.I.E.L.D. also obtains help from independent heroes when their special abilities are needed. It has also accepted some superheroes and supervillains as members, but not in a separate unit. (See "Membership")

Its headquarters is the Helicarrier, a massive flying aircraft carrier kept airborne at all times and, among other things, containing a squadron of jet fighters and housing an intercontinental ballistic missile (ICBM). In addition, S.H.I.E.L.D. maintains strong ties to the superhero community, especially Captain America, the Avengers, and the Fantastic Four, and often calls upon that community for aid on particular missions.