It wasn't an order for you to carry them for grand entry, but he did ask you too. And it is a great honor too. You should be proud that your uncle asked you to do this. Next time let the MC know if asked to do this and they will find someone else to do the honors instead. Even if you aren't a combat veteran you are still serving and thats what counts. You took the time to give up your freedom to protect others. You earned the right to carry them, but if you don't want to carry them, fine thats your business. but I think you should reconsider your thinking on it.
__________________
R.I.P. my Bros from the 1st MAR DIV, 3rd MAR DIV, 25th I.D., 10th MTN DIV, who gave their lives in the Cold War, Marines we lost in Korea during Team Spirit '89 & Okinawa '89- bodies never recovered, Panama, 1st Gulf War, Somalia, Afghanistan, Iraq...
Semper Fi...
