You can honor their service - and look cool, too - with this embroidered patch from Aeroplane Apparel.
The patch Hook and Loops on and stays put.
2 15/16" Diameter Embroidered Patch with Hook and Loop Backing
I already had my dad's original sq. patch but wanted another to put on a jacket. The only difference between them is that one is new. The colours are exactly the same. It's great!