should not feel the criticism is an attack on you personally. If you do, your capacity to learn from experience and to improve will be diminished. SMOOTH VERSION. —Someone must check the smooth, or final, version of the corre- spondence before it is presented for signature. This task normally falls to the supervisor of the originating office. The supervisor should check the smooth correspondence for the following: Use of correct standard subject identifi- cation code (SSIC), if used Inclusion  of  all  required  informa- tion or the exact transcription of the approved  draft Use of correct titles of all addressees (action, via, and information) Observance of proper chain of command for addressees Proper labeling and attachment of en- closures, if any Inclusion of proper number of enclosures Use of approved format If the supervisor finds typographical or spelling errors,   correct them in the manner approved by your command. If your command permits, you may make up to two ink corrections if they are neatly made. SECURITY CLASSIFICATION. —Proper security classification of correspondence is a serious problem in the Navy, largely because people overclassify it. When you write cor- respondence, be sure you show the classifica- tion on the rough draft and handle the draft as required by that classification. No simple rules for security exist. You must follow various policy directives, and, when in doubt, apply common sense. Overclassified correspondence results in too few people being informed too slowly. Assign each piece of correspondence the lowest classification possible consistent with the proper protection of the information contained in it. You do not have to classify correspondence according to the classification of its references unless the correspondence is actually classified. Classify correspondence and documents according to their content, not according to their rela- tionship to other documents. That procedure is particularly important when documents are part of a series. Various paragraphs or sections of a single document may contain different classifi- cations. The document must bear the highest overall classification of its contents. The assigned security manager will assist you in determining the correct security classification for outgoing correspondence. Department of the Navy Information and Personnel  Security  Program  Regulation, OPNAVINST 5510.1H, contains regulations and guidance  for  classifying  and  safeguarding classified  information. Types of Correspondence Official correspondence in its true sense covers all recorded communications, including messages. Since the preceding section covered naval mes- sages, we have confined our discussion of types of correspondence in this section to letters and endorsements, memoranda, and NAVGRAMS. STANDARD NAVAL LETTER. —Although you always double space rough text to allow space for reviewing officers to make corrections or insertions, always single space the smooth final copy. Figure 2-15 illustrates a one-page standard naval letter in finished form. Before you begin the letter, you should determine the addressee(s) to enter in the To Block and the addressee(s), if any, to enter in the Via Block. Then follow the procedures shown in the Department of the Navy Correspondence Manual, SECNAVINST 5216.5C to prepare the letter. ENDORSEMENT. —An endorsement is a brief form of a naval letter on which an official recommends action or makes comments, forwards a letter, redirects a misaddressed letter, or endorses a letter back to the originator for further information. You will frequently use endorse- ments to transmit correspondence through the chain of command. An endorsement becomes part of the basic letter; therefore, it is not routinely used to reply to a letter. Place an endorsement on the signature page of the basic letter if space and length of endorsement permit (see fig. 2-16). The 2-39