Cruise operations involve both sea-based and land-based divisions of labor. Sea-based operations are divided into sailing operations, led by the first officer, and hotel operations, led by the hotel manager. Land-based operations include corporate leadership roles like the CEO and various vice presidents who oversee areas like marketing, sales, and operations. Travel agencies play an important role in selling cruises and come in various forms like independent agencies, agency chains, and cruise-only specialists. Agents receive training and certification from the Cruise Lines International Association to become accredited cruise counselors.