The launch was the North's first this year.
"We learned a lot of skills that were multi-capable back in the late 1980s that we are now dusting off."
The unmanned Tritons rotating through Guam received sensor upgrades since their last deployment.
Mobility Guardian, a massive exercise for airlift and aerial refueling, involved 3,000 troops and 70 mobility aircraft from the U.S. and six allies.
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