Initial requirements for which of the following items are not requisitioned because they are automatically distributed to the installation?

The initial requirements for missiles are not requisitioned because they are automatically distributed to the installation based on predetermined factors such as operational need and inventory levels. This automatic distribution process ensures that installations receive the necessary quantities of missiles without the need for a formal requisition.

In contrast, the requisitioning process is typically required for other items such as bombs, ammunition, and explosives, where installations must assess their own requirements and submit requests accordingly. This differentiation reflects each type of munition's logistics and distribution processes, as well as the strategic importance placed on missiles in military operations. By having a system that automatically distributes missiles, the military can maintain readiness and streamline supply chain management for critical operational capabilities.