WASHINGTON — The first surprise, for the Finnish conscripts and officers taking part in a NATO-hosted military exercise in the Arctic this spring: the sudden roar of a U.S. Marine helicopter assault force, touching down in a field right next to the Finns' well-hidden command post.

The second surprise: Spilling out of their field headquarters, the Finnish Signal Corps communications workers and others inside routed the U.S. Marines — the Finns' designated adversary in the NATO exercise and members of America's professional and premier expeditionary force — in the mock firefight that followed.

Copyright 2022 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed without permission.