[The Alliance Army was created for the sole purpose of the war at the edges of Valner, and it is comprised of the dominant races in the world.
Because if it's unique structure which forces integration at the level of a squad or unit, it was very unpopular at the beginning of its conception but has slowly been accepted.
However, even if the worlds' leaders have accepted this arrangement, it does not mean it is respected among those low in rank.
It is common for there to be racial discrimination and segregation among squadrons where someone of a different race is posted.
This system is not perfect, but has gone a long way in promoting positive relations among the top powers.
The story of the formation of the Alliance Army happened a long time ago when it was discovered that the barrier surrounding Valner had partially disappeared.
The mysterious barrier had surrounded Valner for so long that it had been broadly forgtten by the general populace.