My husband is a newly retired Senior Chief from the Navy. I agree that pilots are usually officers. I've never heard of one being enlisted. You should confirm his new rank with your friend. My husband had a fellow Senior Chief retire from the Navy recently, and the cake decorator put the officer emblem on the cake rather than the Chief. It was awkward for him to say the least. You definitely don't want that to happen with your friend in celebration of her husband's promotion. If he actually did get promoted to Chief, you could put the Chief's anchor on the cake. My husband and I did this for a retirement cake. The anchor was 3D and made out of fondant. Making the cake a khaki CPO hat with the Chief device on the front that was suggested is also a great idea. I would definitely incorporate something Chief into the theme rather than the Navy emblem by itself. Becoming a Chief is a huge deal, and I think it would be more meaningful for the event. GOOD LUCK!!