this seems like one of those things where it's just ubiquitous, so of course Terrorists would use it. like Toyota trucks [1]
[1] https://medium.com/war-is-boring/the-toyota-pickup-truck-is-...
[1] https://medium.com/war-is-boring/the-toyota-pickup-truck-is-...
I still miss the Wikipedia article "List of Guantanamo Bay captives accused of possessing Casio watches" (I think republished at http://wikialpha.org/wiki/List_of_Guantanamo_Bay_captives_ac... ) which seemed to give evidence that watch ownership was used to classify people in detention camps.