The Federal Erusian Navy is the seafaring branch of the Federal Republic of Erusea's military. It was one of the world's most prestigious naval forces, comparable only in size and power to those of the Osean Federation and the Union of Yuktobanian Republics. The Erusian Navy also boasted that its "invincible" Aegir Fleet was untouchable and unsinkable by any form of enemy attack. It was one of the most highly skilled, highly equipped, and highly trained in the region, and for most of the Second Usean Continental War, the Erusian Navy dominated the waters surrounding the Usean continent.