This kit is part of an early effort in the 1970s by AMT to market quality Hasegawa kits in the USA. Hasegawa made the kits and decals in Japan and shipped them to AMT, who supplied the boxes and marketing. Kit is very nicely detailed with fine panel detail, cockpit, open/closed bomb bay doors with internal iron bomb load, tail "stinger" and detailed landing gear with good well detail.
The B-47 was a very advanced aircraft at the time. The XB-47 first flew in 1947. The big jet's speed was equal to or greater than all current fighter aircraft, so it received radar-controlled twin 20mm cannons in the tail as the only guns. Through the use mid-air refueling, the B-47 gave SAC it's first all-jet force for nuclear or regular bomb delivery. Although it was tricky to fly, Stratojets flew into the mid 1960s. A program to strengthen the wings for low-level attack was responsible for prolonging the service life.