WAR!
This is yet another level where speed is easier than going slowly. Run through the level until you start meeting skedar and take them out with your phoenix to get a mauler. You can go a bit slower to use your maian soldiers well, but keep moving. When you get to the first king, if you go across it and round the rotating pillar you can shoot it in the head with a charge up mauler without it seeing you, and this is a one-hit-kill. The second king is even easier. You can let it see you and it won't move or fire for about 2-3 seconds, giving you a good chance to shoot it in the head too. The final king will fire at you a bit, but you can just strafe around itand keep trying to hit it in the head as this is quite easy.
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