There was a time when the United States Army issued the same watch to each soldier.  These days are over.  All United States soldiers are not issued the same watch.  In fact, it may be surprising to learn that in most situations, members of the military in the US have the option to wear a wide variety of watches in the field and in tactical situations.  Usually this decisions is made individually by the Unit.  The one thing that all real military watches have in common, however is that they are all built to military specifications of various standards.