Beautifully detailed model of a Delta IV M+ (4,2) expendable launch Vehicle. M+ indicates this is part of the Medium family of Launch Vehicles. The designation number (4,2) refers to its lift properties. 1st number (4) refers to the diameter of the payload fairing (PLF) - in this case 4 meters , The 2nd number(2) refers to the number of boosters (SRMs) strapped to the main rocket (CBC or Common Booster Core) to augment lift. Delta currently launches from Cape Canaveral FL and Vandenberg AFB in CA.