Possible Clues:

• Mark made on hand, perhaps drumming
• Military signal
• Where drums employed, trash on top
• It might be covered in a job interview?
• A colourful design, but it's not unbeatable!
• Decoration on skin
• Indelible impression made by drumming
• Beat it to make it skinny
• ... — volunteers — to races round circuit in military display
• Skin drawing