text: Targeting and Army Air Support Requests
  Figure E-4. Air Support Request Numbering
  E-20. The two-letter ATO day designation is created by assigning the number of the month and day to their
  corresponding letters in the alphabet. Since January is the first month of the year and “A” is the first letter of
  the alphabet, January would be designated as “A”, February “B”, March “C”, etc. The first day of the month
  would also use the letter “A”, resulting on January 1st being annotated as ATO day “AA” and January 26th
  being annotated as ATO day AZ. When the date of the month exceeds the number 26, the second letter starts
  over at “A”. See table E-2.
  Table E-2. Example air tasking order day calendar
  Air Tasking Order for March 2023
  SUN MON TUE WED THU FRI SAT
  26 27 28 1 2 3 4
  BZ BA BB CA CB CC CD
  5 6 7 8 9 10 11
  CE CF CG CH CI CJ CK
  12 13 14 15 16 17 18
  CL CM CN CO CP CQ CR
  19 20 21 22 23 24 25
  CS CT CU CV CW CX CY
  26 27 28 29 30 31 1
  CZ CA CB CC CD CE DA
  FRI – Friday, MON – Monday, SAT – Saturday, SUN – Sunday, THU – Thursday, TUE – Tuesday, WED – Wednesday
  E-21. The three-letter unit identification portion of the AIRSUPREQ number is used to identify the
  requesting unit. The first letter signifies the senior Army HQ. The senior Army HQ is the highest Army
  echelon of command, for example theater Army or JFLCC. Each unit is assigned a letter that represents their
  HQ. Table E-3 on page E-8, is a notional example of the first letter of the unit identification portion of an
  AIRSUPREQ number.