This Dead Design offering is a set of masks for the Insignia and other markings applied to the ICM 1/48 B-26 Invader. As you can see these are post WWII insigni with a couple of different designs of insignia along witht he USAF, wing walk areas, fuel filler caps, and pro warning stripes. These are all direct replacements for the kit decals and provide the kit decal numbers as a reference to help you apply them.
If you have never tried to paint on markings, you might want to give these a try. They are fairly large as these sets go so would be a good set on which to start. Well worth picking up.