Navy Admiral Alvin Holsey, the commander of US Southern Command, will retire in December, Defense Secretary Pete Hegseth said, depriving the Pentagon of a top military officer as it wages a deadly campaign of military strikes against suspected narco-traffickers in the region.

Holsey, 60, is stepping down less than a year after taking up the post last November. Separate statements posted by Holsey and Hegseth on social media gave no indication of why he was deciding to step down now.