The Tragedy of the Sullivan Brothers
On November 13, 1942, Japanese torpedoes fired into and sank the American cruiser USS Juneau. It was during the battle of Guadalcanal in the South Pacific. Onboard that ship were five brothers: George, Joseph, Francis, Madison, and Albert Sullivan. They had all enlisted into the U.S. Navy after the death of their friend at Pearl Harbor.
Source: Wikipedia
The brothers requested to serve together on that ship and the U.S. Navy agreed. It hadn’t been a common practice by the U.S. Army to place siblings together, yet it wasn’t discouraged either. By that point, they didn’t have a good enough reason to deny their request. There were officials that saw it as a way to keep family morale high. In fact, at least 30 sets of brothers were serving on the Juneau alone at the time of its sinking.