The Dumb Colonel Act: A book on perfecting the 'Dumb Act' by Colonel Jack O'Neill.
Never let friends, co-workers or anyone else that believes 'the Act' see the files on your home computer. It is best to let them believe that you are completely confused by any technology that doesn't shoot, fly or explode and that you don't have a home computer.
Don't let anyone who doesn't need to, I stress the word need, see your personal files. This leads to people knowing your educational background.
Avoid all conversations that have the words college, degree, education and any other word of this type as it might lead to someone asking about your schooling.
Don't let on that what they are saying is interesting to you. When certain Majors and archaeologists start lecturing on some very important and interesting breakthrough, put on a blank, confused face and pretend you're not listening and you don't know exactly what they're talking about.
Acting smart is only allowed in cases where it is absolutely necessary or where it can be blamed on an alien technology (i.e. learning latin to get Earth and many other planets out of a time loop and writing up plans on how to fix the gate when I had that Ancient Download thing).
If all else fails, say you can't remember it (i.e. Locker Room incident, Ancient Download knowledge).
Don't let anyone know how much you know. It leads to people asking you questions, expecting better reports and expecting you to pay attention. Only bad things come out of people knowing you are smart.
Only let on that you can plan out tactical maneuvers and fight.
Let your team explain things to you in simple terms. It's more fun to see them get really excited about something than having to tell them that you've known about whatever they're trying to tell you since you found some clue on the planet. And that you figured it out before them.
Letting your team know that you paid attention in high school classes is okay as long as they don't ask what classes you were taking.
Being introverted makes this charade easier to pull off. If you don't let anyone know much about you, then if they eventually find out that your not a complete idiot it won't suprise them.
Do not underestimate or overestimate anyone. Just because two of your team members have doctorates doesn't mean they will figure out that a Colonel in the U.S Air Force cannot be an idiot. Though they can try.
Testing is a good way to perfect your act. Try something, if it works keep it. If it doesn't don't use it.
Don't let anyone see this guide. It will immediately throw you charade in the trash.
Don't annoy superior officers. I can tell you from experience, it is not a good idea. Superior officers do not like being annoyed.
When a life or death situation arises, as they seem to often, it is okay to clue your smart teammates onto a solution using simple terms (i.e. That Ben Franklin thing, pull the plug). Solving military problems where force and strategy all that are needed.
And most important don't fight with your archaeologist when it has to do with diplomacy. You may be smart, but people who can put Dr. before their name are smarter.
Good Luck!