True statement. None of the calculators (staynavy, etc) go higher than 75, and isn't the only way you can retire with higher than 75% is to have five stars on your collar or a MoH around your neck (under the 10% increase in retired pay rule)?
EDIT: Just remembered that five-stars technically don't retire. The principle is the same though.
Not true. It was changed earlier that you can actually earn up to 100% retirement pay. I'm at the airport right now so can't cite the source, but I'll do it tomorrow.