How about a gift certificate for a private tour of a military museum? You could also consider getting them some war documentary DVDs or books on famous battles and heroes. Additionally, you could perhaps find a war movie screening or festival event taking place near them and get them admission tickets. Other ideas could include getting them a personalized dog tag with their favorite military quote or insignia, or a unique and custom-made military themed painting.
Or you can get her/him a star map with the date when she/he was born.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.