Combat Belt
Basically, a "tactical belt" at this point is any belt that's made with strong webbing and marketed to some segment of the gun community, basically any belt of that design. In its original setting, a tactical belt would really just be a durable belt that was part of a person's combat uniform. Various bits of gear could be added or removed for mission-specific uses. Those various bits of kit could include things like mag carriers, a radio, a handcuff case, a canteen, and so on and so forth.
