The Air Force fired a security unit commander on Wednesday after his unit lost a machine gun and 19 grenades within the span of less than three weeks.

Col. Jason Beers, former commander of the 91st Security Forces Group at Minot Air Force Base in North Dakota, was fired Wednesday “due to loss of trust and confidence after a series of events under the scope of his leadership, including a recent loss of ammunition and weapons,” according to a statement from Minot.