 MiG-21 units have limited time in these training exercises and spend more time in simulators and maintain their skills flying with the commercial brand of the air force Aerogaviota.At San Antonio de los Baños military air field, south west of Havana, several aircraft are visible using Google Earth.In 1988, the Cuban Navy boasted 12,000 men, three submarines, two modern guided-missile frigates, one intelligence vessel, and a large number of patrol craft and minesweepers.