21 4-19. During what MOPP level is individual protective equipment issued? 1. One 2. Two 3. Three 4. Four 4-20. During what MOPP level will the individual protective mask be main- tained in carrier and on person? 1. One 2. Two 3. Three 4. Four 4-21. During what MOPP level will individuals don chemical protective overgarments? 1. One 2. Two 3. Three 4. Four 4-22. During what MOPP level will individuals don their protective masks? 1. One 2. Two 3. Three 4. Four 4-23. Which o f the following periods is the maximum time a closure or fitting may be logged open? 1. One watch period 2. During normal working hours 3. 12 hours 4. 24 hours 4-24. Items requiring special management control because the material is essential to the protection of life or is relatively valuable and easily can be converted for personal use are called 1. expendable items 2. replacement items 3. controlled equipage 4. consumable items 4-25. Which system is responsible for naming, describing, classifying, and numbering all items carried under centralized inventory control by DoD and civil agencies of the federal government? 1. Federal catalog 2. Navy supply 3. Local supply 4. National supply 4-26. Stock and control numbers used to identify and order material in the supply system are known by which of the following terms? 1. National stock numbers 2. Navy item control numbers 3. Local item control numbers 4. All of the above 4-27. A national stock number (NSN) consists of a total of how many digits? 1. 9 2. 11 3. 12 4. 13 4-28. The national item identification number (NIIN) identifies each item of supply used by which of the following organizations? 1. Department of Defense 2. North Atlantic Treaty Organization 3. Both 1 and 2 above 4. United Nations