Briefly, while the US Army is hurting for recruits and has started to allow obvious tattoos it previously banned, the People's Liberation Army is tightening their image:
...tattoos "tarnish the military's image". Traditional ethnic tattoos will be allowed if they are not too obvious when the recruit is wearing shorts.
Incidently, the PLA is also banning heavy snorers. Not sure if there's a link or if there's a comparable with the USA.