The Walleye (fig. 8-19) is a self-contained, self-guided, high explosive weapon. It is grouped into three basic series of weapons—Walleye I (small-scale, 1,000 pounds), Walleye II (large-scale, 2,000 pounds), and Walleye II Extended Range Data Link (ERDL). UNDERWATER WEAPONS Since World War II, the Navy has placed major emphasis on the development of air-launched torpedoes and air-laid mines. These weapons incorporate components  so  sensitive  that  their  operation  is protected as classified information. Therefore, the unclassified information we can provide on these weapons is limited. Torpedoes The Mk 46 torpedo is the primary weapon used in antisubmarine warfare (ASW). It is designed to search for, detect, attack, and destroy submarines. The torpedo can be assembled into exercise configurations, and it can be used for training. The tactical torpedo consists of a nose section, warhead, control group, long fuel tank, and after-body. The physical characteristics (such as weight, length, and other features) vary with the configuration and the launch accessories attached. The Mk 46 torpedo can be configured with aircraft launch accessories for either helicopter or fixed-wing aircraft launching. Aircraft-Laid Mines Naval mines may be used in either offensive or defensive mining operations. In either case, the primary objective is to defend or control straits, port approaches, convoy anchorage, and seaward coastal barriers. Aircraft mine delivery has been the principal method for large-scale mining attacks into enemy coastal and port areas. Mines that are delivered by aircraft are usually carried and dropped in much the same manner as bombs. Mines have different ballistic flight paths than bombs. Air-laid mines usually require parachutes. Q8-13. What are the two types of rockets used by the Navy? Q8-14. Long-range guided missiles can usually travel at least what distance? Q8-15. Define the term Mach number. Q8-16. Guided missiles are classified according to speed. What are the four classifications? Q8-17. What are the three significant color codes used on guided missiles? Q8-18. Walleye guided weapons differ from other guided missiles in what way? Q8-19. What are the basic underwater weapons used by the Navy? 20-MM AUTOMATIC AIRCRAFT GUNS LEARNING OBJECTIVE: Identify the basic operation, characteristics, and components of the 20-mm automatic aircraft gun. 8-18 PROTECTIVE NOSE SHROUD GUIDANCE WARHEAD CONTROL CLAMP WING FIN RAT PROPELLER RAT PROTECTIVE COVER CLAMP ELECTRICAL CONNECTOR AND TEAR STRIP EJECTOR PAD ANF0819 Figure 8-19.—Typical Walleye guided weapon.