COUNTERPOISE CORROSION FATIGUE A failure of a metal resulting from the combined action of corrosion and fatigue (cyclic stressing). CORROSION POTENTIAL A potential of a corroding surface in an electrolyte relative to a reference electrode (also known as rest potential, open-circuit potential, or freely-corroding potential). CORROSION RATE A measure of the speed (usually averaged) at which corrosion proceeds, expressed as a weight loss per unit area or thickness change per unit time. Alternatively, the corrosion cur- rent density (in amps per unit area) gives a measure of the instanta- neous rate of corrosion for specified conditions of the environment at a given time. CORROSION RESISTANT STEELS Steel with sufficient alloy content (usually chromium and nickel) to resist atmospheric corro- sion; sometimes called "stainless" steels, although they are neither stainless nor rustless. A wide variety of analyses and properties are included in the term corrosion-resistant steels. COSMETIC SOLID MODEL A computer aided design (CAD) 3- D dimensional solid model sufficiently defined to provide a visual understanding of the item, but not fully defined in all respects. COUNTERMEASURES The art of employing devices and tech- niques to impair the operational effectiveness of enemy activity, such as anti-missile defense systems. COUNTERMEASURES, ACTIVE ELECTRONIC Countermeasure devices or techniques, based on the use of elec- tronic systems, of such a nature that their use can be detected by the enemy. COUNTERMEASURES, CHAFF Narrow metallic strips that reflect electromagnetic radiation and can be dispensed by incoming missile or aircraft to create radar echoes that confuse enemy radars. COUNTERMEASURES, ELECTRONIC The use of electronics to reduce the effectiveness of enemy equipment or tactics that can be affected by electromagnetic radiation. COUNTERMEASURES, PASSIVE ELECTRONIC Electronic countermeasures that are of such a nature that their use cannot be detected by the enemy. COUNTERPOISE A system of wires or other conductors elevated above and insulated from the ground, forming the lower system of conductors of an antenna. For overhead lines, a conductor or system of conductors arranged beneath the line, located on, above, or most 77