Strategypage discusses the evolution of cell phones vs. military radios.
This is one place where COTS could really cut down on expenses. My latest cell phone has a camera, plenty of storage with a mini-SD card, and would be almost perfect for virtually any mission. It even fits into a shirt pocket. The traditional radioman (like Luz in Band of Brothers) may be obsolete. now a days, the CO may have his cell phone and a Bluetooth headset.