Losan, you're absolutely correct - my mistake about the 5-star thing. I was tired... lol
quiteone - I don't want to sound argumentative, but USMC and USA enlisted ranks are distinctively different. With the exception of E-2 and E-9, one cannot simply change the colors and expect their insignia to be accurate. The crossed rifles on the Marine E-3, E-4, E-5, E-6, E-7and E-8 insignias and the Globe & Anchor on the E-9 insignia simply do not exist on the Army insignias. In addition, the Marine E-3, E-4 and E-5 insignias have (for lack of a better description) a rocker without a stripe to accomodate the crossed rifles - essentially making the overall shape of the rank different.
Again, I don't want to sound argumentative, but I don't want folks to think that they can just change the colors and viola! Army ranks!
Yes, they are vaguely similar, but they would require much more work than simply changing the colors in order to be accurate.