Here are a few ideas for what a typical flag might look like. Feel free to get creative and design your own. They can be as simple (nothing more than a scrap of coloured cloth) or as complex (as shown below) as you like.
The included applications "Operation Name Generator" and "The Subtitle Option" allow you to come up with new names for your exercises. Operation Name Generator allows you to randomly generate names such as "Operation: Resolute Thunder" or "Operation: Valiant Dawn" while The Subtitle Option allows you to generate secondary names such as "The Prometheus Conspiracy" or "The Shiva Protocol".