Fleet Admiral Jim Wilson, born James Tiberius Wilson, was the commander of the UNSC First Response Fleet and captain of the UNSC Annihilator, his flagship. Team Alpha and Dragon Squadron are usually under his command. He once had a wife, Kymberli Wilson, but she died during the Battle of the Beacon. He has a daughter, Katelynn Wilson, though for two decades of her life she didn't know he was her father.
In the Alternate Universe, Jim Wilson joined the Team Alpha project along with his wife. He and his wife were part of the first wave, and his daughter became part of the second wave.
Battle for a Covenant Homeworld
Insurrection Quelling on Ontario III
Second Battle of the Sol System
Arctic IV Campaign
Battle of the Beacon
Last Battle of Ceres
↑An obvious reference to Star Trek's James Tiberius Kirk. I couldn't resist ;)