This weekend I hopped in my trusty F6F to go do some vehicle busting.  When I went to select ord on climbout there wasn't any.  I turned around and landed, went to the hanger and in fact I had no ord selected, 25% fuel and was in fighter mode rather than attack.  I guarantee I never changed it from my usual attack mode with full fuel, 2x1000 lb bombs and 6 rockets.
This has happened to me before.  I particularily recall having a Spit reduced to 25% fuel on me recently.
In an unrelated matter, when I did re-up (in the F6F this weekend) I decided to switch fields.  Wouldn't you know, just as I was taking off the convoy darted out in front of me killing me on the runway.  That was almost enough to get me to quit (at least for the day).