Well, I have searched for US Army infantry training manuals, and cannot find reference to the system I was trained to use.
So maybe I am not remembering the name correctly or something,m but it works like this....
View attachment 311883
The filled in brown circles are natural obstacles that provide 'solid' cover, which is redundant I know, but many confuse cover and concealment, lol. Artificial cover can be constructed with sandbags and gravel/sand/etc. It should be thick enough to withstand hits from small 1 or 3 inch guns or 50 cal machine guns. Obviously this should protect the personnel from direct fire perpendicular to the line of defense, standard Soviet idiot tactics from the mid 1800s.
The empty black circles are two man pits that give room enough for side chambers to be dug for personal sleep and storage (didnt draw those) and if made of rock or thick logs, they can also limit grenade frags spread. The empty purple small circles are the grenade sump, about 8 inches wide and a 45 degree slope and a foot and a half deep. The ground of the hole should slope to the sump to facilitate kicking a grenade into it, and allowing the blast to be directed to the back of the hole while the two soldiers crouch forwards.
The blue areas are interlocking fields of fire, one filled in light blue for illustration. As these fields are diagonal to the approach of enemy forces, they reduce for the enemy the ability to take cover from obstacles to slow their approach.
The 'Final Lines of Fire' are designated positions for full auto fire in three round bursts of all men in the squad. It is an emergency tactic to prevent being over run by enemy infantry. The infantrymen just swing their rifles to that predesignated stake (thanks, Lieutenant Who?) and fire for effect with no lengthy time given for a timely aim, just shoot their asses off as fast as you can. The red lines are personnel weapon FLF and the green line is the squad machine gun.
The fields of fire are restricted within the defensive position ie 'fox hole' using stakes and the weapons are kept within the field of fire to reduce the likelihood of friendly fire from other squad members. Usually the Final Line of Fire is one of those boundary stakes but not absolutely.
The best marksmen are given the wider fields of fire. The squad machine gun is placed at either end for maximized effectiveness.
Does this trigger anyone's memory or am I just that much of a dinosaur? lol