The Japanese had flak guns of various calibers. 7.7 mm, 13.2 mm, 20 mm and 25 mm light flak guns. A 40 mm medium flak gun was the only bridge between lighter and heavier types. One of the most used and successful heavy guns was 75 mm gun which was also a success as an anti-tank gun, like the German 88 mm Flak36/37, and at first it was believed that this Type 88, as it was designated in Japan, was a copy of that famous and dangerous German gun. The larger calibers were also of 80, 88, 100, 105, 120, 127 and 150 mm. Only two were produced of the largest calibre and was introduced at the end of the war. The larger calibers were used mostly in Japan.
Japanese flak radar was not as advanced as the German counterparts and was not used to any wider extent. The gunners were often guided buy a spotter plane, flying at the same altitude as the bombers, relaying data to the flak batteries. If more than one bomb run was flown over a target the accuracy would often improve because the gunners could use the data from the first run.
In 22nd Bomb Group: Marauders from Australia Japanese flak will be reflected by having only a small chance of having radar guided flak and other ranges of Flak Intensity.