Byrne is the engineer of the Debbie Sue, a crab fishing boat.
Byrne tackled "Greenhorn" out of the way of a falling crab net. Later, as the boat approached a burning oil rig, Byrne watched it, the boat unable to go any closer.
Goyer, David S., Nolan, Christopher (writers) & Snyder, Zack (director) (June 14, 2013). Man of Steel.