MIL-STD-1168C
4.6.4 Suffix sequence and exceptions. The suffix is a one to two character code that usually progresses sequentially. When reworking any items of ammunition at a manufacturing activity or sustainment activity, where the application of an ammunition lot suffix is required, the following letters shall not be used as suffixes except as noted herein:
a. "E" - no exceptions. Ensuring E is used just as a lot identifier, and not a suffix, helps quickly identify and prevent experimental products from being unintentionally released into the supply stream. (See 4.7.2)
b. "I" - no exceptions. Can easily be confused with the number "1."
c. "O" - no exceptions. Can easily be mistaken for the number "O" (zero).
d. "X" - no exceptions. (See 6.4)
e. "Y", "W", and "T" - no exceptions. Can be confused with the ammunition theater indicator codes. (When new theater indicators are identified, they shall be added to this suffix exclusion list.)
The suffix sequence is initially: A, B, C, D, F…V, Z. Due to some lots requiring suffixes beyond Z, a second suffix character may now be used. After Z, the suffix transitions to: AA, AB, AC, AD…AV, AZ, BA, BB…ZV, ZZ. The excluded characters may not be used in either space of the two character suffix.
4.6.5 Suffixing of lots prior to Government acceptance. Unless otherwise specified (see 6.5), when a lot of materiel is rejected at the point of original manufacture or assembly and it is determined that the lot can be made usable by actions such as rework or repair, a suffix shall be authorized (see 6.12) and applied to the lot. Lot suffixes will be assigned in alphabetical sequence as defined in 4.6.1 with exceptions as noted in 4.6.4. A note shall be placed in the remarks of the ADC stating what suffix was assigned, what rework was performed, and that the parent lot (the lot without the suffix) does not exist. When only a quantity of the lot is being reworked, the first change or rework performed shall be identified by affixing a capital letter suffix "A", the next change or rework of the same basic lot or quantity thereof for the same item shall be identified by the addition of a "B" suffix, etc. A note shall be placed in the remarks stating what rework was done and the parent lot of the quantity. Use Example 2 and
4.6.6 as a guide to suffixing quantities less than the entire lot.
Example 1:
Lot EEE97J006-002 original production lot is rejected. After reworking, the lot number becomes EEE97J006-002A. The reworked lot EEE97J006-002A is again rejected and reworked. The revised lot number then will be EEE97J006-002B, etc. Authorizations for the suffixes were obtained from the appropriate QAR, ACO, PCO, or PQM.
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