Kodiak, Alaska (KINY) Alaska municipalities and preservation groups have opposed the exercise in recent years.
The U.S. Pacific Command exercise involves all military services and other agencies.
The exercise is held every other year and includes over 6,000 service members, 200 aircraft, and multiple Coast Guard cutters and Navy destroyers.
The Kodiak Daily Mirror said the opposition comes from groups concerned about harm to aquatic wildlife and the environment.
The Kodiak Island Borough asked that the training be moved to September so that marine mammals, fish, and migratory birds will be less impacted.
Republican Sen. Lisa Murkowski requested in 2017 for the military to consider moving the 2019 event to the fall.
The Navy's environmental assessment in 2016 determined the impact on fish and marine mammals would be minimal,