Gunner, I'm pretty sure that you sent me something and I e mailed that USMC study to you. If not let me know. Like Dave said, it is exactly the same. The math is not any different and the problems almost appear in the same order. Some of the problems had the EXACT same numbers. I also found it extremely helpful on the aviation/nautical info sections. Just remember Delta is an airline, not a Lunar Module. In other words, just about everything you need to know is covered in the prep guide. ARCO was basically useless to me. I worked those books front to back twice. Only helped with the mechanical comp and spacial apperception portions. If you have any brain waves at all, which I'm sure you are a smart guy, then you should have no problem with the mechanical stuff. Ex: when you back a car and swing it left, which way does the trailer go? Really, it's that easy!