Not just the US; Prince of Wales is in there too.Per wiki there's actually no Ticonderoga class of the US' in the Nato Maritime Response Group 1 anymore and a (very brief) bit of looking at the maritime tracking site doesn't have any other US ships popping out at me in the area (though there was a USNS Sisler in port in Norway...A ship whose name I immediately am glad exists and am certain the crew have nicknamed 'Sizzler' after the restaurant chain*...But she's a transport ship).
*Or maybe not, since they might have more respect than me.
Looks like the US is throwing the carrier in dependent upon the allies ships for escort-dutying (unless one of the transponders that's giving off the generic 'NATO Warship' descriptor is something American being semi-sneaky).
Though good bet the generic ship names are US ships trying to be sneaky.