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This region. i was in iceland and the u.s. navy is telling me they're concerned about the things they're seeing from russia. the "u.s.s. e smpt smps.s. iwog" they're gearing up if there as an attack. corporal derek hussinger is part of the invasion force. >> get the guns in position, put the tripod down, set the gun up. we have a stable platform. >> reporter: the exercise also a deterrent as the north atlantic region becomes more contested. with this exercise the u.s. and allies are practicing their response. the adversary is fictitious, it comes in time of growing tensions of the u.s. and rus...

Protection. fred pleitgen has more from onboard a war ship off the coast. >> the uss iwo jima off the coast of iceland, in the hangar deck, marines gearing up for an air assault. retaliation if there's an attack on a u.s. ally. corporal derrick husinger is part of the invasion force. >> get our guns situated, put the tripod down, set the gun up, and stable platform. >> the exercise also a deterrent, as the north atlantic region becomes more contested. with this exercise, the u.s. and its allies are practicing their response in case a friendly nation gets attacked. the adversary is fictitious, ...

The "uss iwo jima" off the coast of iceland. marines gearing up for an air assault. retaliation if there is an attack on a u.s. ally. corporate derek husinger is part of the invasion force. >> we get our guns situated, put the tripod down, set the gun up and then stable platform, press and fire. >> reporter: the exercise also a deterrent, as the north atlantic region becomes more contested. the u.s. and allies are practicing their response in case a friendly nation gets attacked. on the adversary, it comes at a time of growing tensions for the u.s. and russia. as the marines race to the icelan...