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MH1. HTHE is a regiment within the Defence Forces and within that part of the ground forces. The regiment has maybe a squadron sized sub-unit with these ships. This isn't the regiment's main area but explosives generally, with some sarcasm I could call it a glorified bomb-squad.
They are called if someone fishes out an unexploded WWII bomb or a shell from the Danube. Otherwise their boats are present the August 20 fireworks held on a bridge of the Danube. This two are the regular job of the riverine force I believe, I dunno what they do for NATO.