I think I have found what I need. I decided to use the guard's badge image that I had to start with, since it is a bit more detailed. It is smaller, but what I need it for is a decal, and it only needs to be about 7/8" tall, so it will work pretty good. I tried a few test prints of it, and it looks pretty sharp.
I wanted a larger version because it always looks best to reduce a larger image than to enlarge a smaller one. If you can get by enlarging by a factor of 2 only, then the image will not pixilate to badly. Luckily, I enlarged the badge by 200% and it's perfect.
I have decided to model the plane in the link I posted earlier (EP210), since my plane's current color scheme pretty closly matches that bird. I'll post a picture of my model when it's done. If I can figure out how to print decent decals myself, then I'll have it done in a few days. However, I think I'm going to need to order a custom set of decals, at which point it may take quite a bit longer.
Thanks for all the help