In my setting the army complained it spent generations training local forces now just to fight them. The war became very unpopular after people in the core started being drafted, and sent to fight an insurgency across a hundred new worlds. The government responded by firing the Army commander. The Navy accused the army of losing the war. Similar to the Roman Social War.There is the occassional donnybrook, which escalates to a broughaha, then to a full blown chingaso.