gift for step dad anniversary

today is my mom and step dad anniversary and it is also mines and his. he bought me a necklace that says i love you to the moon and back. it’s been 11 years since hes been my dad. i love him to death, he is bummed out because my mom has never said happy anniversary to him and this year i would like to do something different. i am a teenager and he works on airplanes i want something he can wear or carry around. any ideas ?