well i took out the left and right lasers first.
For the left one i used a decoy so it would not attack my war tank and rocket. I had a bomber kill the right (with a fighter to ensure the bomber stays alive for his task.
then i went on the offensive with anti tanks and bombers and i won in 8 days with a score of 438.
It is hard but once you figure out that you can trick the morts were to attack you can win fairly easily. (think of how to lure the enemys missile silo strikes to were ya want them in other games. Also remember most money hitting target = the attack
the morts alternate each turn (left,right,left,right......)
good thing the lasers in the mid cant rotate or i would be annoyed so much :\