Senior military leaders from around the Asian-Pacific region are gathering on Oahu this week for a conference hosted by Adm. Robert Willard, the head of the U.S. Pacific Command.

Representatives from 27 nations including Australia, Japan, and South Korea are attending the meeting at a Ko Olina hotel.

The Pacific Command says the annual Chiefs of Defense Conference is meant to bring leaders together to discuss security challenges, improve relationships, and foster cooperation.

Last year’s conference was held in Seoul and was co-hosted by the U.S. and South Korea. The four-day meeting ends Thursday.