Both Harry and William are wearing badges with their name printed on them - "Harry Wales" and "William Wales". Harry is wearing the RAF Shawbury's crest/logo seen in the above bottom left photo featuring the Lions/Felines.
William's badge is more elaborate than Harry's. He is wearing a badge of the No. 60 Squadron RAF (who are stationed at RAF Shawbury http://en.wikipedia.org/wiki/RAF_Shawbury ). His crest/logo is seen in the above bottom right photo.
William's Squadron crest is said to be "a markhor's head and was approved by King George VI in December 1937. Chosen to commemorate many years of service in North-West India, the markhor being a mountain goat frequenting the Khyber Pass. The horns of a markhor were presented to the Squadron in 1964.'' http://en.wikipedia.org/wiki/No._60_Squadron_RAF