Chapter  1—INTRODUCTION military  requirements  for  advancement.  These manuals are: Basic Military Requirements, NAVEDTRA 10054  (current  edition) Military   Requirements   for   Petty   Officer 3 & 2, NAVEDTRA 10056 (current edition) Military   Requirements   for   Petty   Officer I  &  C,  NAVEDTRA  10057  (current  edition) Each of the military requirements manuals is mandatory at the indicated pay grade levels. In addition  to  giving  information  on  the  military requirements, these three books give a good deal of useful information on the enlisted rating struc- ture; on how to prepare for advancement; on how to supervise, train, and lead other people; and on how to meet increasing responsibilities as you ad- vance in rating. Some of the rate training manuals that may be useful to you when you are preparing to meet the  occupational  qualifications  for  advancement are discussed briefly in the following paragraphs. Tools and Their Uses, NAVEDTRA 10085 (current edition), contains a good deal of useful information on the care and use of all types of handtools and portable power tools commonly used in the Navy. Blueprint Reading and Sketching, NAVED- TRA 10077 (current edition), chapters 1 through 4 and chapter 7, recommended reading in prepar- ing for advancement to EN2. The remainder of the  training  manual  contains  additional  informa- tion that may be of value to you as you prepare for advancement to EN1 and ENC. Mathematics,  Vol.  1,  NAVEDTRA  10069 (current   edition),   and   Mathematics,   Vol.   2, NAVEDTRA  10071  (current  edition),  may  be helpful  if  you  need  to  brush  up  on  your mathematics. Volume 1 contains basic informa- tion that is needed for using formulas and for making simple computations. Volume 2 contains more advanced information than you will need for most purposes. However, occasionally, you may  find  the  information  in  this  book  to  be helpful. Engineman 3 & 2, NAVEDTRA 10541 (cur- rent edition), must be satisfactorily completed for advancement to EN3 and EN2. If you have met this  requirement  by  satisfactorily  completing earlier  editions  of  training  manuals  prepared  for Enginemen,  you  should  at  least  become  familiar with  Engineman 3 & 2, NAVEDTRA 10541 (cur- rent edition). Much of the information given in this edition of Engineman I & C is based on the assumption that you are familiar with the con- tents of Engineman 3 & 2, NAVEDTRA 10541 (current edition). Rate  training  manuals  prepared  for  other Group  VII  (Engineering  and  Hull)  ratings  are often a useful source of information. Reference to  these  training  manuals  will  broaden  your knowledge of the duties and skills of other per- sonnel  in  the  engineering  department.  The  train- ing  manuals  prepared  for  Machinist’s  Mates, Boiler Technicians, and Machinery Repairmen are likely to be of particular interest to you. For a complete listing of rate training manuals, consult the List of Training Manuals and Cor- respondence  Courses,  NAVEDTRA  10061  (latest revision). Correspondence  Courses Most rate training manuals and officer texts are used as the basis for correspondence courses. Credit for the completion of a mandatory train- ing  manual  is  earned  by  passing  the  cor- respondence course that is based on that training manual. You will find it helpful to take other cor- respondence courses, as well as those that are based  on  mandatory  training  manuals.  A  cor- respondence course helps you to master the in- formation given in the training manual or text. It also gives you a good idea of how much you have  learned. NAVSEA PUBLICATIONS A number of publications issued by the Naval Sea Systems Command (NAVSEA) will be of in- terest to you. While you do not need to know everything that is given in the publications men- tioned here, you should have a general idea of where   to   find   information   in   NAVSEA publications. 1-9