Final answer:
The two major types of TPFDDs are Requirements-driven and Resource-driven, with the latter being influenced by the availability of resources for mission planning and execution.
Step-by-step explanation:
The two major types of Time-Phased Force and Deployment Data (TPFDD) are Requirements-driven and Resource-driven. Requirements-driven TPFDD is based on the needs and objectives that must be met for a mission, while Resource-driven TPFDD is influenced by the availability of resources such as personnel, equipment, and materiel. The prioritization of resources dictates the planning and execution of an operation.