 Complete the following phrase:  In 1977 and 1978, Bull orchestrated the illegal sale of 30,000 155mm artillery shells, gun barrels and plans for the GC-45 howitzer as well as radar equipment to Armscor, the South African state arms corporation; with two shipments made through Antigua in 1978 and another through Spain in 1979. The South African Defence Forces arsenal of vintage howitzers  antiquated by the arms embargo  had been outperformed by BM-21 Grads during 