Lunatik101:Arbiter should have gone hunters and locusts. Send the hunters in while keeping the locusts far. It is even more difficult to stop this combo when they have a couple of cobras with them. For the UNSC, Cobras and scorpion tanks. Drop the ODST once in combat and try to have the marines rocket the tanks and wolves in an individual manner.
locusts have range but not as good of damage compared to fully upped wraiths, and wraiths take a hell of alot more hits which is good to keep the targeting off the hunters. Wraiths are dope once they are fully upgraded too i would take them over scorpions any day, + they put up a good fight against grizzlies so just throw a couple hunters instead of wraiths and you got yourself a tank killin army. not to mention leader powers rape face any ways.