The US Army issued orders in a standard OPORD format, the British Army used a similar one (but changed to the US style after the war). There are lots of scans of contemporary documents at:
http://www.carlisle.army.mil/usamhi/DL/AtoZ.htm
If you look at the operations orders for Operation Shingle (Anzio), Page 12 has an operations order in OPORD format, divided up into Situation,Mission, Operations, Admin & Comms sections.
The censor has been a bit liberal with his black pen, so some bits are quite hard to read!
There are a lot of scans of After Action Reports as well, but the format for these is less standardised.
Cheers