The setting afloat is USS Coral Sea (CV-43), an aircraft carrier of the Midway class; she served 1947-90. She was redesignated as CVA-43 in 1952, and she remained as such for the remainder of her service. She was known by the nickname of the Ageless Warrior.
AWACS stands for Airborne Warning and Control System, which is an airborne radar system designed to detect aircraft, ships, vehicles, missiles, and other incoming projectiles at long ranges. AWACS systems are mounted on aircraft to allow them to be mobile and get better high altitude radar coverage than ground stations. The CAG says that Iraq has an old Soviet A-50 Mainstay, which is the NATO reporting name for the Beriev A-50, a Soviet airborne early warning and control (AEW&C) aircraft. AEW&C aircraft operate AWACS systems, conduct surveillance and function as command and control centers for nearby aircraft. The United States operates two different types of AEW&C aircraft: The Air Force operates the Boeing E-3 Sentry, a modified Boeing 707 that has a large radar dome mounted on the dorsal part of the aircraft, the E-3 also carries powerful computers designed to be able to detect, analyze and decrypt virtually every kind of electronic signal. The Navy operates the Northrop Grumman E-2 Hawkeye, a turboprop carrier-capable tactical airborne early warning (AEW) aircraft, the older version of this aircraft only had AWACS capabilities as its smaller size did not allow room for the computers needed for a command & control aircraft. In service since 1960 the Hawkeye is the oldest carrier capable aircraft in the world. In 2007 the Navy acquired an updated version of this aircraft called the E-2D Advanced Hawkeye which features an entirely new avionics suite including the new AN/APY-9 radar, radio suite, mission computer, integrated satellite communications, flight management system, improved T56-A-427A engines, a glass cockpit and aerial refueling. These upgrades, coupled with modern compact computer design, made the E-2D the Navy's first carrier capable AEW&C aircraft, as the older versions did not have the proper equipment to allow it to act as both a AWACS and a command & control aircraft.
"Angels" is a NATO standard term for military aviators to quickly and clearly announce their altitude in increments of 1,000 feet, so "angels one" is a clear, quick way of saying "my altitude is 1,000 feet", "angels 30" would be 30,000 feet. The reason they say "angels" instead of "altitude" is to allow pilots from different nations that speak different languages to be able to communicate important information clearly and quickly. Which is why the militaries of all NATO member nations use the same phonetic alphabet and code words, like "Angels" for "altitude", "Whiskey" for "location", "Fox (number for type)" for "friendly missile fired", "Popeye" for "flying in clouds or area of reduced visibility", "Vampire" for "hostile anti-ship missile" or "Winchester" for "no ordnance remaining" just to name a few.