The document proposes using modified M113A4 armored vehicles to vertically transport infantry squads over rubble and debris in urban areas. It notes the vehicles provide combat-proven mobility with applique armor protection and a boom arm to deliver troops to unexpected locations on buildings. The document advocates for this approach to overcome predictable top-down or bottom-up urban assault tactics that expose infantry to enemy fire. It suggests using smoke and situational awareness to mask vertical assaults from the enemy.