Swedish Navy's "Aggressor" Sub

The navy continues to explore ASW with a Swedish d/e sub, HMS Gotland. From Navy Compass:

The Swedish submarine HMS Gotland participated in a Joint Task Force Exercise (JTFEX) Dec. 6-16 with Commander, U.S. 3rd Fleet and the USS Ronald Reagan (CVN 76) Carrier Strike Group, off the coast of Southern California.According to Swedish Liaison Officer Lt. Cmdr. Peter Ostbring, Gotland and her crew played a number of roles during the joint exercise, which mutually benefited the U.S. and Swedish navies by enhancing overall anti-submarine warfare (ASW) proficiencies and further strengthening the relationship between the two countries."Initially, [Gotland] was acting as an opposing force, and in the middle of the exercise, she acted as a green (friendly force) submarine, like a third country in a coalition doing intelligence and reconnaissance missions for the strike group," he said. "Later, she returned to being an opposing force."

Over the next several months, Gotland will continue training with the U.S. fleet, focusing on integrated ASW exercises that enable all components of the Navy's ASW forces - air, surface and subsurface - to test and assess their tactics, doctrine and ASW education. Likewise, Gotland will continue to gain training experience and enhance interoperability while participating in exercises with U.S. forces. Working together, the United States and Sweden are fostering multinational interoperability to combat security threats.