On 27th-28th April 1944, Just a few miles from 115th Station Hospital on Dartmoor, Double tragedy happened during a large-scale rehearsals with 23,000 allied servicemen for the D-Day invasion of Normandy, which took place on Slapton Sands in Devon. Coordination and communication problems resulted in friendly fire deaths during the exercise, and on the following day under the cover of darkness an Allied convoy of 8x USS-LST positioning the ships for a beach landing were attacked by 9x E-boats of Nazi Germany's Kriegsmarine, 2x USS-LST were sunk and 1x severely damaged by the torpedo attacks with around 500 men on each ship fully laden with fuel, weapons, medical trucks and half tracks, resulting in the deaths of at least 749 American servicemen. This disaster was classified as top secret, as this could effect morale and jeopardise the D-Day invasion of Normandy six weeks later, Slapton Sand Disaster for 40 years was not officially recognised.

My grandfather's 115th Medical Unit on Dartmoor were the closest U.S. Army Hospital with 750 beds to Slapton Sands, just over 20 miles away. with 392 combat trained field medics and 120 nurses. All medical staff at military hospitals who treated the wounded were sworn to secrecy under threat of court martial and prison. My grandfather took this secret to the grave when he passed away 1977 and in the 1980s the disaster became public for the first time. We may never know the official role the 115th played during Operation Tiger.