DOD has released the 2018 CONUS COLA rates and approximately 7,000 less military members will be eligible for the pay in the coming year. CONUS COLA is paid to military members stationed in high-cost areas in the US. It is a taxable pay that is paid in addition to regular pay and station allowances. The rate varies by geographic location, rank, years of service, and dependency status.
For more details, see this Military.com article.