The 100-lb. Quick Opening Cluster E44 (designated as the M25 until January 1945), of 14 10-lb. HC Smoke Bombs M77 (Fig. 7) was designed to provide frontal of flank cover for amphibious operations or troop movements and to blanket large areas of enemy posi-tions with smoke. They are for use over land only. Tests have shown that each cluster opens a few feet below the releasing plane and when dropped from 500 feet altitude disperses its bombs over a somewhat elliptical area about 50 yards across. The bombs requrie two to four minutes after hitting the ground to build up an effective screen, and will produce smoke from eight to twenty minutes. Instructions for the proper operational use of these clusters may be found in Cominch publication P-04 "Smoke Screens for Am-phibious Operations". This cluster will function satisfactorily from altitudes of 50 feet to above 5000 feet. A small percentage of duds (10%) may be expected from all altitudes.

Figure 7 - View showing side of 100-lb. Cluster E44 (quick-opening) made
up of 14 HC Smoke Bombs M77