22 October 2021 U.S. Sixth Fleet Participates in Italy’s Mare Aperto Exercise TYRRHENIAN SEA - The Arleigh Burke-class guided-missile destroyer USS Porter (DDG 78), U.S. Navy P-8A Poseidon aircraft from Commander, Task Force 67, and the Henry J. Kaiser-class fleet replenishment oiler USNS Kanawha (T-AO 196) recently participated in the Italian-led multilateral maritime...