A slight correction to your post. The Enola Gay is actually a B-29. It like the other B-29's was manufactured at the Martin plant very near here (Omaha). The headquarters of the US Strategic Command, which oversees our nuclear strike capabilities is headquartered here now. The museum formerly associated with the air force base tried for a long time to get the Enola Gay brought back here from the Smithsonian before Udvar was built. Previously they only had the cockpit on display at the Air and Space museum. As for the B-36, it debuted after World War II as the replacement for the B-29 as a nuclear delivery vehicle. Like the XB-70 they are incredibly rare today. There is one B-36 here, one at Wright Patterson, and one or two in other places. That is it. The plane didn't last long and was quickly phased out with the advent of the B-52's which the air force still uses today.