Pilots Individual Combat Chart

[Eagle0025]

I have some forms for several 474th FG pilots called a Pilots Individual Combat Chart. It is essentially a summary of the combat missions flown by a pilot. The form appears to be a standard AAF form. It has five columns listed as follows: Date (of mission), Time (mission duration), F.O., Sortie (no. of missions flown on that date), and Destination (type of mission and target area).

The field I need help with is the "F.O." column. I believe this stands for Field Order (the official AAF document ordering a mission), but I'm not sure. The numbers in this field go in ascending order (197, 204, 218...). Some of the later missions show a letter (e.g. 410-B, 433-K, 437-L...). Some later missions have other designators such as 138 (Y21-8), 140 (Y21-10), 142 (Y51-2) and so on.

Can anyone tell me the exact meaning of this field and it's contents? Many thanks in advance.

Cheers, Gary Koch