This quote from another site explains what I believe you should be looking for:
FM (30-88 MHz) - These frequencies have traditionally been used by ground or surface forces, and you'll most likely find them used by aircraft which interact closely with such forces. Helicopters and close air support aircraft like the A-10 are the most likely to make use of this band. This band is also shared with a multitude of other services. The 30-50 is the VHF-Low land mobile band, filled with sheriffs and cement trucks. 50-54 is occupied by amateur radio (on a shared basis), 54-72, and 76-88 are TV channels, and 72-76 is more land mobile. Most military ops are found in set-aside federal segments of this band, including 32-33, 34-35, 36-37, 38-39, and 40-42 MHz. Even so, some units regular operate in the low 50s to the upper 60's. Most units will keep their frequencies within a few MHz of each other because of the differences in antenna length/impedance over this range.
Link to page: Radio Bands & Equipment
Yes, I agree that you have found the correct audio control panel