Countries Participating In Rimpac 2024. This year’s rimpac will host its largest humanitarian aid and disaster relief exercise with eight countries, five ships, five landing craft, five aircraft, multiple land forces, and over 2,500 total participants. In addition to the 40 naval vessels, three submarines and over 150.

3rd fleet hosted military members from 24 countries at the exercise rim of the pacific (rimpac) 2024 initial planning conference. Set to begin on june 26, the rim of the pacific or rimpac exercise is the world’s largest international maritime exercise that will involve nearly 29 nations, 40.