[Stellan Bojerud (RIP)]

I think Iwo Jima is probably the best example of a combined operation.

1. The need for Iwo Jima
The Ground Forces (Army & USMC) had no interest in Iwo Jima
The Navy had no interest in Iwo Jima
The Airforce needed Iwo Jima as an airbase for the final assault on Japan

2. Getting there
The Navy had the ships reguired

3. Getting ashore
The USMC could make a landing

4. So ---
The Navy brought the Ground Forces there. USMC and later also Army units took the island because the Airforce needed it.