The Ace Combat Player of The Republic of Osea is a huge, orderly nation, ruled by Prince Viridian Mazlo Hassel-Dannau with an iron fist, and renowned for its keen interest in outer space, infamous sell-swords, and stringent health and safety legislation. The hard-nosed, hard-working, cynical population of 827 million Oseans are ruled by a mostly-benevolent dictator, who grants the populace the freedom to live their own lives but watches carefully for anyone to slip up.

The medium-sized, corrupt government juggles the competing demands of Education, Administration, and Industry. It meets to discuss matters of state in the capital city of Oured. Citizens pay a flat income tax of 47.0%.

The frighteningly efficient Osean economy, worth 100 trillion Zollars a year, is broadly diversified and led by the Information Technology industry, with major contributions from Tourism, Book Publishing, and Arms Manufacturing. Average income is an impressive 120,956 Zollars, but there is a significant disparity between incomes, with the richest 10% of citizens earning 348,793 per year while the poor average 33,298, a ratio of 10.5 to 1.

Annulments are on the rise as couples discover their ancestors were born in the same hospitals, where there's smoke there's the Osean Forestry Department, "What's the Frequency, Prince Viridian Mazlo Hassel-Dannau?" is a favorite phrase of backyard radio broadcasters when interrupting official diplomatic channels, and agricultural employees work for peanuts. Crime, especially youth-related, is totally unknown, thanks to a capable police force and progressive social policies in education and welfare. The Republic of Osea's national animal is the White Wolf, which frolics freely in the nation's many lush forests.

The Republic of Osea is ranked 172,299^th in the world and 862^nd in 10000 Islands for Lowest Overall Tax Burden, scoring 11.2 on the Hayek Index.