On occasion, the Imperial Japanese Army will deploy support strikes, in an effort to weaken or destroy the Allied defenses. The likelihood of enemy support strikes is determined by the Enemy Artillery Support variable. At the beginning of each wave, a random number is drawn between 0 and 1000. If this number is less than the Enemy Artillery Support variable, then an enemy support strike is deployed. It takes anywhere between 10 to 45 seconds before the enemy support strike is deployed.
Enemy Artillery Support is calculated as the total number of soldiers and vehicles the player has on the field, with vehicles counting as two soldier's worth of units.
Japanese Officers may also call in support strikes. Each time an enemy officer successfully surveys the area with his binoculars, a random number between 0 and 4500 is drawn and compared against the Enemy Officer Support Strike variable. The likelihood of an Officer issued support strike is determined by the total number of soldiers and vehicles the player has on the field, minus any soldiers hidden by foliage and camouflage nets, raised to the power of 2.35.