A U.S. Army Soldier assigned to Combined Joint Task Force - Horn of Africa practices the Objective Bull, a task that requires the evacuation and treatment of a casualty, in preparation for an Expert Infantryman Badge (EIB) evaluation at Camp Lemonnier, Djibouti, Jan. 22, 2018. The EIB is a coveted special skills badge that requires infantry Soldiers to pass a five-day evaluation that consists of an Army Physical Fitness Test, day and night land navigation, a 12-mile forced march, and 30 individual tasks covering weapons, medical, and security patrol skills. In an April 2016 EIB iteration at Camp Lemonnier, only 15 percent of candidates earned the badge. (U.S. Air Force photo by Staff Sgt. Timothy Moore)

A U.S. Army Soldier assigned to Combined Joint Task Force - Horn of Africa throws a training grenade in preparation for an Expert Infantryman Badge (EIB) evaluation at Camp Lemonnier, Djibouti, Jan. 23, 2018. The EIB is a coveted special skills badge that requires infantry Soldiers to pass a five-day evaluation that consists of an Army Physical Fitness Test, day and night land navigation, a 12-mile forced march, and 30 individual tasks covering weapons, medical, and security patrol skills. In an April 2016 EIB iteration at Camp Lemonnier, only 15 percent of candidates earned the badge. (U.S. Air Force photo by Staff Sgt. Timothy Moore)

A U.S. Army Soldier assigned to Combined Joint Task Force - Horn of Africa throws a training grenade through a window in preparation for an Expert Infantryman Badge (EIB) evaluation at Camp Lemonnier, Djibouti, Jan. 23, 2018. The EIB is a coveted special skills badge that requires infantry Soldiers to pass a five-day evaluation that consists of an Army Physical Fitness Test, day and night land navigation, a 12-mile forced march, and 30 individual tasks covering weapons, medical, and security patrol skills. In an April 2016 EIB iteration at Camp Lemonnier, only 15 percent of candidates earned the badge. (U.S. Air Force photo by Staff Sgt. Timothy Moore)

A U.S. Army Soldier assigned to Combined Joint Task Force - Horn of Africa loosens the boots of a simulated heat casualty during training for an Expert Infantryman Badge (EIB) evaluation at Camp Lemonnier, Djibouti, Jan. 23, 2018. The EIB is a coveted special skills badge that requires infantry Soldiers to pass a five-day evaluation that consists of an Army Physical Fitness Test, day and night land navigation, a 12-mile forced march, and 30 individual tasks covering weapons, medical, and security patrol skills. In an April 2016 EIB iteration at Camp Lemonnier, only 15 percent of candidates earned the badge. (U.S. Air Force photo by Staff Sgt. Timothy Moore)

A U.S. Army Soldier assigned to Combined Joint Task Force - Horn of Africa wraps a bandage around a simulated burn wound of a casualty during training for an Expert Infantryman Badge (EIB) evaluation at Camp Lemonnier, Djibouti, Jan. 24, 2018. The EIB is a coveted special skills badge that requires infantry Soldiers to pass a five-day evaluation that consists of an Army Physical Fitness Test, day and night land navigation, a 12-mile forced march, and 30 individual tasks covering weapons, medical, and security patrol skills. In an April 2016 EIB iteration at Camp Lemonnier, only 15 percent of candidates earned the badge. (U.S. Air Force photo by Staff Sgt. Timothy Moore)