Musée National d'Histoire Militaire (MNHM) has shared some information about the public reception of Grand Duke Jean's service as an "Irish Guard".

In their Facebook post on Tuesday morning, the National Museum of Military History (MNHM) refers to Grand Duke Jean's past as an "Irish Guard" during WWII. The post begins with a quote by the late Grand-Duke himself: 
"The uniform of the English army is in this war the uniform of freedom and liberation" (BBC, Jean of Luxembourg, 28.07.1943)

The post then goes on to mention briefly how Prince Jean received a gift for his service:

"After Prince Jean’s commission as First Lieutenant at the "Irish Guards" on July 28, 1943, a dinner was organized at the Luxembourg Embassy in London on 3 October. On this occasion, the Luxembourgish volunteers of the Allied Armies presented Prince Jean with a gift: a “customized” Webley revolver bearing his monogram."

In a previous post, published on Monday morning, the museum also explained how Prince Jean came to join the "Irish Guards":

"As a reaction to the forced conscription of Luxembourgish men, proclaimed by the Nazis in August 1942, Prince Jean volunteered for the British Army. Following King George VI’s suggestion, Prince Jean was enlisted in the Irish Guards. After his "Pre-Officer Cadets Training Unit", he joined the Sandhurst “Royal Military College” to complete his 6 months officer training at the Mons Barracks in Aldershot."

RTL

Prince Jean on the left in the front row. Brigade Squad, Guards Depot Caterham January 1943. / © Collection MNHM