yes I know Ustio is not confirmed to have a navy but its likely they have a small navy like the irl Switzerland

For the Combat ships would be the pt-16 class gunboats as they are more efficient and faster than the older Aquarius class gunboats and speaking of the Aquarius class

I think Ustio would convert Aquarius class gunboat into utility boats so personnel can be shuttled by sea.

The Ustio Navy would operate aircraft such as the B1900C and B1900D commuter planes as cargo transport and use the ADS-95 Ranger UAV for reconnaissance as for the VIP Transport would be served by a B1900C-1 aircraft and the Utility plane would be the B200 Super King Air modified into B1300 Commuter planes.

when it comes to helicopter force the Ustio Navy would use an EC132T2+ helicopter for VIP Transport and Utility duties