Reserve call signs shall consist of which sequence?

Reserve call signs shall consist of which sequence?

• A. NR, followed by the number of the district and two letters
• B. NR, followed by the district number only
• C. NR, followed by two letters only
• D. NR, followed by the district number and three letters

Answer: (A)

Reserve call signs are built to be quickly identifiable and uniquely traceable across the system. The NR prefix flags the sign as a Reserve call sign. Immediately after comes the district number, which locates the unit within the organizational structure, and two final letters specify the particular unit within that district. This exact sequence—NR, district number, then two letters—gives each unit a unique identifier while keeping the format consistent across all districts. Dropping the district number would blur geographic location, while omitting or misplacing the trailing letters could cause duplicates within a district. Adding three letters would extend beyond the defined format.

Reserve call signs are built to be quickly identifiable and uniquely traceable across the system. The NR prefix flags the sign as a Reserve call sign. Immediately after comes the district number, which locates the unit within the organizational structure, and two final letters specify the particular unit within that district. This exact sequence—NR, district number, then two letters—gives each unit a unique identifier while keeping the format consistent across all districts. Dropping the district number would blur geographic location, while omitting or misplacing the trailing letters could cause duplicates within a district. Adding three letters would extend beyond the defined format.