There were some in the team with tattoos. Every now and then, when you were bored, you were allowed to colour in the tattoos of some of them (the ones you liked of course) with markers.

Since Ghost was out of base with Soap, you could only think of one more. Alex

You saw him in the armoury "Hey there." he turned to you and saw the markers in your hand "Don’t tell me I’m your colour book now.“ he chuckled "Can I?“ you smile as he only nodded and sat down on a bench in the room