I recommend that you install this mod using Long War Mod Manager (http://www.nexusmods.com/xcom/mods/620/?). Alternatively you can use PatcherGUI 7.1 or better if you wish. It should work on any version of Long War beta 15.

This mod shows the name of the soldier's country when viewing an individual soldier in the barracks. Long war has 127 different countries so it's handy to be able to see the names of countries with lesser known flags.