Expeditionary operations vital to routine and crisis-response missions worldwide are at risk of becoming ineffective or unsustainable unless the service rethinks how to conduct them in a new review, according to internal guidance from the Navy's top admiral. The assessment, chartered by Chief of Naval Operations Adm. Jonathan Greenert, calls for developing new concepts to overhaul how the Navy conducts the operations and invests in related capabilities. It is largely driven by fiscal pressures, Marine Corps Assistant Commandant Gen. John...