Originally for my AUs, the first is a version of the South Korean DW1800C corvette design by DSME and the second one is a "stretched" version of CSSC OPV which was exported to Nigeria as the P18N and Thailand as HTMS Pattani and HTMS Narathiwat. The third one is a 1960s destroyer escort, hull built in US and equipped with a mix of American and British sensors and weapons.
Constructive criticisms are welcome! Cheers!