My father served with the PPCLI -- Princess Patricia's Canadian Light Infantry. After arriving in England from Canada, the Princess Pats were shipped to the Mediterranean, participated in the invasion of Sicily and then fought their way up through Italy and Nazi-occupied Europe until the war ended.
At some point, Dad was shot during a firefight in an Italian barn. He fell behind a low wall or divider, with only one arm protruding into the open. Luckily his sleeves were rolled up. A buddy recognized his tats and carried him to safety.
And that's how those sweet and wholesome tattoos saved his life.
[Photo of PPCLI soldier at Ortona, Italy, 1943, found here].