Final answer:
The United States Transportation Command (USTRANSCOM) is responsible for providing strategic air, land, and sea transportation for the Department of Defense across the range of military operations, coordinating missions worldwide and managing the defense transportation system.
Step-by-step explanation:
The organization that provides strategic air, land, and sea transportation for the Department of Defense across the range of military operations is the United States Transportation Command (USTRANSCOM). USTRANSCOM is one of the ten unified combatant commands of the United States Department of Defense. This command coordinates missions worldwide using military and commercial transportation resources.
Established under the Goldwater-Nichols Department of Defense Reorganization Act of 1986, USTRANSCOM consolidated strategic transportation assets to support the United States' global defense posture. It maintains command over the military's strategic airlift, air refueling, and sealift capabilities, as well as overseeing the development of transportation-related plans and policies for defense operations.