Throughout Band of Brothers, each member of Easy Company can be seen with a spade on their helmet, and there's a valid historical reason for this detail. The HBO miniseries Band of Brothers first aired back in 2001, based on Stephen E. Ambrose's non-fiction book of the same name. Following the men of "Easy" Company, 2nd Battalion, 506th Parachute Infantry Regiment of the 101st Airborne Divison, Band of Brothers chronicles the men's journey from the early days of their training right up to the end of World War II.

https://screenrant.com/band-brothers-spades-playing-card-helmet-symbols-meaning/