4-52. What is the distinction between an address group and a Navy-assigned international call sign (ICS)? 1. An address group starts with the letter N; a Navy-assigned ICS does not 2. An address group never starts with the letter N; a Navy-assigned ICS always does 3. An address group always has three letters; a Navy-assigned ICS always has four letters 4. An address group always has letter or number combinations: a Navy-assigned ICS never has letter or number combinations 4-53. Which of the following naval units will NOT be assigned an address group? 1. System command 2. Type commander 3. NODAC 4. Individual ship 4-54. What address group represents a single command or unit, either afloat or ashore? 1. Collective 2. Conjunctive 3. Geographical 4. Individual activity 4-55. What address group represents two or more commands, authorities, activities, units, or a combination of these? 1. Collective 2. Conjunctive 3. Geographical 4. Individual activity 4-56. What type of address group must always be preceded by another type of address group to complete its meaning? 1. Geographic 2. Collective 3. Individual activity 4. Conjunctive 4-57. What address group should be used only when it is necessary to complete the titles of addressees or originators? 1. Conjunctive 2. Geographical 3. Individual activity 4. Address indicating 4-58. What address groups should NOT be used with the name of naval or merchant ships or the titles of commands afloat? 1. Address indicating 2. Collective 3. Conjunctive 4. Geographical 4-59. What is/are the main purpose(s) of address indicating groups? 1. To increase security 2. To increase the speed of traffic handling and to reduce the length of address components 3. To eliminate message headings 4. To notify addressees of incoming messages 4-60. Address indicating groups can be used whenever suitable, regardless of whether the message is classified or unclassified. 1. True 2. False 4-61. What groups are used in the heading and give special instructions? 1. Special address groups 2. Special operating groups 3. Plain language stations 4. Address indicating groups 4-62. Plain language address designators are NOT used in communicating with which of the following activities? 1. A civilian shore installation 2. A U.S. Air Force activity 3. A U.S. Army activity 4. An allied armed forces installation 26