Help with gift choice

[hwyrnr]

Need some advice/help with making a choice. I'm wanting to get my dad a Rolex for Cristmas. My dad is a retired US Naval aviator. I'm tring to decide between a Sub. And GMT. I'm new to Rolex and I have a Sub. And love it. But my question is what is more appropriate for a naval aviator the Sub. Or GMT. My second question is what is the purpose of the pepsi style bezel wether it red/blk or red/blu.

I understand it what's my personal preference and all that. But from what I understand the GMT is more geared for aviation as is the Sub is to diving. I'm sure he will love what ever I get him but wanted to Taylor my decision toward his lifes accomplishments. With him being in the navy either one would work. Just want to know more about the GMT and it's beZels before I decide. And what others opinion is.

Thanks, James