After the first few missions, Col. Peel's position is supposedly overrun by zombies, and he initiated a burst transmission and transfered most of his intel and target profiles to Brigadier General Henry Connors (callsign Highroad Actual), who is located near the Capitol. After the player managed to upgrade the Radio Post and reach Highroad Actual, he becomes mission control and supports the player in place of Col. Peel for the rest of the game.
Examining the character.xml files in Breakdown reveals that a complete character is created for Col Peel, using the template of Alan Gunderson (voice, character model, inventory, even the biography is kept intact). This is the case for all characters that are only heard in the game. They are complete characters with appearances and inventories, not just disembodied voices.
Voiced by Brant Fitzgerald, developer of State of Decay.