1. Moving in a Building - Movement techniques used inside a building are employed by teams to negotiate hallways and other avenues of approach. They are similar to movement techniques employed when clearing enemy trenches.
a. Diamond Formation (Serpentine Technique) - The serpentine technique is a variation of a diamond formation that is used in a narrow hallway. The #1 man provides security to the front. His sector of fire includes any enemy Soldiers who appear at the far end or along the hallway. The #2 and #3 men cover the left and right sides of the #1 man. Their sectors of fire include any enemy combatants who appear suddenly from either side of the hall. The #4 man (normally carrying the M249 machine gun) provides rear protection against any enemy Soldiers suddenly appearing behind the team.
b. Vee Formation (Rolling-T Technique) - The rolling-T technique is a variation of the Vee formation and is used in wide hallways (Figure 712). The #1 and #2 men move abreast, covering the opposite side of the hallway from the one they are walking on. The #3 man covers the far end of the hallway from a position behind the #1 and #2 men, firing between them. The #4 man provides rear security.
a. The team configures into a modified 2-by-2 (box) formation with the #1 and #3 men abreast and toward the right side of the hall. The #2 man moves to the left side of the hall and orients to the front, and the #4 man shifts to the right side (his left) and maintains rear security. (When clearing a right-hand corner, use the left-handed firing method to minimize exposure [Figure 7-13 B]).
b. The #1 and #3 men move to the edge of the corner. The #3 man assumes a low crouch or kneeling position. On signal, the #3 man, keeping low, turns right around the corner and the #1 man, staying high, steps forward while turning to the right. (Sectors of fire interlock and the low/high positions prevent Soldiers from firing at one another [Figure 7-13 C]).
c. The #2 and #4 men continue to move in the direction of travel. As the #2 man passes behind the #1 man, the #1 man shifts laterally to his left until he reaches the far corner (Figure 7-13 D).
d. The #2 and #4 men continue to move in the direction of travel. As the #4 man passes behind the #3 man, the #3 man shifts laterally to his left until he reaches the far corner. As the #3 man begins to shift across the hall, the #1 man turns into the direction of travel and moves to his original position in the diamond (serpentine) formation (Figure 7-13 E).
e. As the #3 and #4 men reach the far side of the hallway, they, too, assume their original positions in the serpentine formation, and the fire team continues to move (Figure 7-13 F).
a. The team configures into a 2-by-2 (box) formation with the #1 and #2 men left and the #3 and #4 men right. (When clearing a right-hand corner, use the left-handed firing method to minimize exposure [Figure 7-14 B]).
b. The #1 and #3 men move to the edge of the corner and assume a low crouch or kneeling position. On signal, the #1 and #3 men simultaneously turn left and right respectively (Figure 7-14 C).
c. At the same time, the #2 and #4 men step forward and turn left and right respectively while maintaining their (high) position. (Sectors of fire interlock and the low/high positions prevent Soldiers from firing at another [Figure 7-14 D]).
d. Once the left and right portions of the hallway are clear, the fire team resumes the movement formation (Figure 7-14 E). Unless security is left behind, the hallway will no longer remain clear once the fire team leaves the immediate area.