This is the DOF clearing what's called "off site" slash or sand pine that was planted years ago (to produce pulpwood/timber) on land where it naturally would not have grown--hence the term "off site." They clearcut these areas to get rid of all of the trees that should not be there and then replant with longleaf pine randomly rather than in rows. These state and federal lands, along with a few private lands like Nokuse Plantation, are really the only place to see Gulf coastal plain forests that look somewhat like they did naturally for thousands of years--mostly longleaf pine with an open understory kept open by frequent wildfires.