Final answer:
The DCC, US Department of Defense, and USO have a history of making appearances for military troops, but the total number of collective appearances is not detailed in the provided material.
Step-by-step explanation:
The Dallas Cowboys Cheerleaders (DCC), the US Department of Defense (DOD), and the USO (United Service Organizations) have collectively made numerous appearances for military troops. These appearances are a continuation of a long-standing tradition of entertainers supporting the military, a tradition that includes many famous figures from the past.
Figures from history like Jimmy Stewart and Carole Lombard participated in wartime efforts, with Stewart serving in the Army Air Force and appearing in Winning Your Wings, while Lombard was tragically killed in a plane crash after selling war bonds.
In the contemporary context, the DCC are known for their performances and morale-boosting visits, the DOD supports and facilitates such efforts with programs for troop entertainment, and the USO has a storied history of organizing events for the armed forces.
However, tallying the total number of appearances made collectively by these three entities isn't specified in the provided material, indicating that more research or access to specific documentation is required to answer the question accurately.