The dispute over a profitable Department of Defense insurance contract continues.Last month, Humana won its appeal to retain the DoD's TRICARE contract to provide health benefits to active and retired military personnel and their families in the south. Humana lost the contract to Minnesota-based UnitedHealth two years ago, but quickly filed the appeal, saying the DoD did not equally judge insurers.Now UnitedHealth has challenged the decision in favor of Humana’s appeal. The company says it provides better quality and prices for the DoD and healthcare providers.