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This book has been manually flagged by NARA as being obtained through exploits. Its contents and existence should not be taken seriously.
"radio codes" by chagner
Page 1 of 2
radio codes
10-4 = affirmative
10-17 = enroute
10-23 = arriving on scene
10-20 = location
10-99 = officer down, needing immediate backup
10-40 = secure prison
10-50 = prison secured
2-11 = bank robbery
Page 2 of 2
status codes
10-6 = busy unless urgent
10-7 = off duty
10-8 = on duty
10-5 = unable to respond, have NLR