(2) Adherence to prescribed procedure is mandatory. Un-' authorized departures from or variations in prescribed procedure invariably create confusion, reduce reliability and speed, tend to nullify security precautions, and are prohibited. If the procedure prescribed hore- in does not cover a specific operating requirement, resorting to initiative and common sense should suffice. (3) The following basic rules are essential ko transmission security and shall be strictly enforced on all radio-~ telephoie circuits, (a) Ko transmission shall be nade which has not been authorized by proper authority, (b) The following practices are specifically forbidden: 2. Violation of radio silence, 2- Unofficial conversation betwoen operators. 3. Excessive tuning and testing. 4 Transmitting the operator's personal sign or name. 5- Unauthorized use of plain language in place §&. Use of other than authorized prowords, 2. Unauthorized use of plain language. g. Linkage or compromise of classified cell signs and address groups byplain language disclosures or association with unclassified call Signs. 9. Profane, indecent or obscene languages of applicable prowords or operating signals. (ce) The following practices are to be avoided: — . 1. Use of excessive transmitting power, , ‘Excessive time consumed in tuning, changing ‘frequency, or adjusting equipment. 3. be. Transmitting at speeds beyond the capabilities of receiving operators. Phonetic Alphabet: (2) When necessary to identify any letter of the alphabet, the phonetic alphabet listed below shall be used: Letter . . Spoken as Bam a we ow wo — BAKER Coe - + -~ = CHARLIE Baw ween ©» m BASY TASK GROUP 7.4 OPRS ORDER NO, 1-54 ANNEX E, APNDX 3 Letter Spoken as Owen ww oe — = OBOE Po--- ~~ - = PETER Rw www = = = = ROGER E3~4