Final answer:
The Joint Strategic Planning System integrates force assignment, apportionment, and allocation into a single management process in support of defense strategic guidance.
Step-by-step explanation:
The system that integrates complementary force assignment, apportionment, and allocation processes into a single management process to support the Defense Strategic Guidance and joint force availability requirements is the Joint Strategic Planning System (JSPS). This system is vital for managing the resources and capabilities of the U.S. military in alignment with strategic objectives. It takes into account various factors such as national security strategy, defense planning guidance, and operational plans to ensure that the military is prepared to meet current and future challenges.