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Military guilds, while RP, are oriented towards PvP, specifically attack or defending. These guilds usually hold an allegiance to their races or their faction. Some, however, have been seen rebelling against their own factions and forming rogue groups.
There are many of these guilds and a lot of names you choose may be already taken. Do not use names such as the "Stormwind Guard" or "Thrall's Guard". The odds are these names have been taken and they are not that imaginative or unique anyways. Names like "Tirisfal Bastion" or "Northshire Knights" might not be taken. You may find ideas turning to the Warcraft Series or books for inspiration. For example, "Tolkien" is not a good idea for names, as it just won't work.
Your tabard should be militaristic. The eye or the scroll symbol are not good ideas, as they reflect more on lore-type guilds than you. Crossed swords, battle axes or something of the like might work but they are not the most original out there and may be in use. This could cause a clash with other RP guilds if you inadvertently copy their tabard. Make your tabard unique and at the same time make it look good.
Always use original names in roleplaying guilds. Your race's military could help here. Humans might have ranks like "knight" or "cleric" while blood elves might have ranks like "Ranger-General" or "Farstrider". The Gnomes are based around their technology. Examples by race (examples are not last word):
|Ranks||Human||Night Elf||Dwarf||Gnome||Draenei||Orc||Troll||Tauren||Forsaken||Blood Elf|
|Guild Master||High Lord||Ranger Lord||Thane||High Tinker||Prophet||Chieftain||Witch Doctor||Chieftain||Commander||Ranger General|
|Sergeant||Pikeman||Captain||Mortar Officer||Operator||Vindicator||Guard||Axe Thrower||Breaker||Officer||Ranger|