Well, if you keep losing your war games, you should probably keep playing until you win.
I recall reading a story where someone kept winning against the US side in a war game, and instead of changing tactics, the guys running the US side just kept adding more and more restrictions to what the opposite team was allowed to do, until they finally lost. (Wish I had a link to the story. [EDIT: jmhobbs has it, https://news.ycombinator.com/item?id=6770236)
Huh, kind of like Ender's Game, except for the loss part.