the category of maintenance. The numbers given to the different categories, or levels of maintenance
are as follows:
"10" indicates operator or crew-level maintenance.
"20" indicates organizational maintenance.
"30" indicates direct support maintenance.
"40" indicates general support maintenance.
Table 1-2. Technical and supply publication series and titles (except for supply catalogs).
If an equipment technical manual is applicable to more than one level of maintenance, the first digit
indicates the lowest level and the second digit the highest. For example, "-24" indicates that the
technical manual is applicable to the organizational, direct support, and general support categories of
maintenance. A two-digit maintenance code category followed by a "P" indicates that the technical
manual is a parts manual.
General Subject Technical Manuals. These publications are numbered in the same manner
as equipment technical manuals, except that a subnumber is assigned for further identification within
the series. For example, the general subject technical manual Military Chemistry and Chemical Agents
is assigned the number "3-215." The "3" is the basic series number identification for Chemical. The
"215" is the subnumber identifier. If TM 3-215 were published in more than one volume, a suffix would
be added to the end of the sequence, making the complete number for the third volume TM 3-215-3.
Supply Bulletins. SBs contain information pertaining to the mission objectives of supply
operations. They are numbered according to the classification of the subject matter with a basic series
number from AR 25-30. A subnumber follows to distinguish the SB from other bulletins on the same
subject. For example, SB 742-1, Ammunition Surveillance Procedures, is one source of information
that will be very valuable to you in your job. In this example, "SB" indicates a supply bulletin, "742"
indicates the inspection of supplies and equipment, and "-1" is this manual's number.
Technical Bulletins. TBs contain technical information on specific weapons, equipment, and
professional techniques, as well as on general subjects. They are numbered in the same manner as
General subject technical bulletins are assigned basic numbers that are the same as those used for
general subject technical manuals.