A combat tactical modular vehicle structure including a center frame module comprising a front bulkhead a cab portion and a rear bulkhead where the center frame module includes an integrated armor so that the integrated armor is a part of center frame module or the center frame module has at least one piece of armor attached to the center frame module, a front frame module comprising an engine subframe where the front frame module is connected to the front bulkhead by a plurality of mechanical coupling devices, and a rear frame module comprising a gearbox subframe where the rear frame module is connected to the rear bulkhead by the plurality of mechanical coupling devices for selectively connecting and disconnecting the front frame module to the front bulkhead without substantially affecting the connection and the rear frame module to the rear bulkhead without substantially affecting the connection.