With the drone launching stand on the rear of the SR-71; it is actually a M-21. The two craft together were referred to as M/D-21. This kit is a simple but nice build. If you don't use the drone launching stand it is a good SR-71 model and the drone can be displayed on the cart supplied in the kit. Applying the decals can be a problem due to the corrugated surface of the wings. Applying them over gloss paint and using Micro Sol will take care of most of the problems.