The direct wire SmartCord is compatible with contemporary Escort Passport 8500 X50, Solo S2, and Passport 7500S models, along with earlier Passport 8500, 7500, and 6800 detectors. This is the first destroyer escort class with the Naval Tactical Data System and OYQ-7 combat direction system. The Zumwalt class destroyer is the namesake of Admiral Elmo Russell Zumwalt, Jr., the youngest four-star admiral in U.S. A History of the Staggering losses suffered by the U.S. This contributed to perceptions in the west that the Soviets lacked gratitude for the efforts of and losses by the Western Allies. Matériel losses in the convoy were: 3,350 vehicles, 210 aircraft, 430 tanks and 109,466 short tons (99,316 t) of other cargo such as food and ammunition. Wild dogs roamed Tokyo streets searching for food, but sometimes became food themselves. The Anglo-Americans also undertook to send 42,000 long tons (43,000 t) of aluminium and 3, 862 machine tools, along with sundry raw materials, food and medical supplies. Because of this, he primarily speaks in sign language and has trained himself to not make any noise when he sleeps. When the head of the Soviet Military Mission in London, Admiral Nikolay Kharlamov and the Soviet ambassador, Ivan Maisky, asked when Convoy PQ 18 would sail, Pound said nothing could be done until better air cover was arranged - after which Kharlamov criticised the order to withdraw the cruisers from Convoy PQ 17. Pound, angered by the comment, stated that he had ordered the convoy to scatter; Maisky commented that "even British admirals make mistakes".