None that I know of. I always thought it a pity that Eureka didn't add some hatted head variants to their USMC range. You could try asking Nic or see it head swaps from the old Minifigs' WW1 range on to Eureka bodies would work. They did a pack of US infantry in greatcoats wearing campaign hats.
By the by, I think you meant Caribbean and Central America. The US didn't intervene in South America at this time, at least not in a direct, military sense.
Nice model of the San Pablo too.