Patches and badges is important part of the standard military uniform all around the world. Military units, departments and security services use them for identification. For example widely spread military patches, biker patches, sport patches, name patches.
No doubt, in every place you will feel under the protection seeing security officer, who has badge sewn on his sleeve or back. Commonly sleeve badge has half circle shape and the badge on back has big size with the lettering "Security". Only professional security organizations have its own insignia and you can be sure your safeness is under control.
Otherwise looks officer who wear security uniform with no signs of the identification, nobody can't distinguish him from the hunter, fisherman, just simple visitor or at last from the robber:)- it is absolutely unclear who's this man and what is he doing here.
Government and ungovernment departments, security organization, companies in the private sector commonly regulate and control the badge designs and on how their badges and patches are desplayed on the uniform.