To explain the picture, I will point you to the Jonathan Pollard website:

David Siegal of Yakir enclosed the attached photo in a letter he sent to Jonathan Pollard: a picture of his soldier son, Levy, receiving his purple Beret. "Look closely at his kipa," David wrote to Jonathan.

Jonathan looked at the photo and was amazed to his own "reg number" (inmate prison number) embroidered in large bold numbers on Levy's kipa: #09185-016:

David, explained in his letter to Jonathan that both he and Levi wear Jonathan's reg number on their kipas in solidarity. He wrote that the reg number arouses curiosity and when people ask, it gives them the opportunity to educate others and to generate prayer and concern for Jonathan.

Jonathan was deeply touched by this gesture. He asked his wife to contact David and see if she could obtain a copy of the photo of his reg number on Levi Siegal's Kipa. As you can see, David gladly obliged.