and modern German military protocol, "Herr" ("mister") is said before ranks when someone is addressing a person of higher rank. For example, a lieutenant ("Leutnant") would address his captain as "Herr Hauptmann" ("Mr. Captain"). Superior officer address subordinates with "Herr" and their last name or simply their rank, but not adding "Herr" to the rank. This practice was forbidden in the Waffen-SS, as it offended Himmler's egalitarian principles. Hetzer – agitators; also a hunting dog and as such the unofficial name of a certain mid-war model of German tank destroyer. Hilfswillige (Hiwis) – German Army volunteer forces usually made up of Soviet volunteers serving in non-combat capacities. Himmelfahrtskommando – literally, "trip to heaven mission", a suicide mission. Hinterhalt – ambush. Hitler-Jugend (HJ) – Hitler Youth. The German youth organization founded by the Nazi Party (NSDAP). Made up of the Hitlerjugend proper, for male youth ages 14–18; the younger boys' section "Deutsches Jungvolk" for ages 10–14; and the girls' section "Bund Deutscher Mädel" (BDM). Hitlersäge – "Hitler saw", nickname of the MG42 machine gun. Also named "Singende Säge" (singing saw), "Knochensäge" (bone saw) or "Hitlersense" (Hitler scythe) HJ-Fahrtenmesser (Hitler Youth knife) – common dagger specially designed for the Hitler Jugend. HJ-Spätlese – nickname for the Volkssturm. Höckerhindernisse – anti-tank obstacles often referred to as "Dragon's Teeth". Hoheitsabzeichen – national insignia e.g. on a tank or aircraft. Hohentwiel – FuG 200 UHF-band (500 MHz) maritime patrol airborne radar gear. Hubschrauber – helicopter. Hufbeschlagschmied, farrier. Hummel – "bumble-bee"; nickname for a piece of mobile artillery. Hundehütte – literally, "dog house", punishment hut. I im Dienst (i.D.) – in service. Indianer – Indians. Luftwaffe slang for an enemy fighter (from the game of cowboys and Indians.) Infanterie (Inf.) – infantry. Inhaber der Befehls- und Kommandogewalt (IBuK) – commander-in-chief, Minister of Defence (peacetime) or Federal Chancellor (wartime) Iststärke – actual strength (compared to Soll-Stärke) Iwan – German slang for a Soviet soldier (similar to "Jerry" or "Kraut", the British and American slang terms for Germans). J Jabo (Jagdbomber) – fighter-bomber. Jagdgeschwader (JG) – single-engine fighter wing/group, literally hunting squadron. Jagdpanzer – "hunting tank"; armoured casemate-style self-propelled tank destroyer. Jagd-Kommando – "hunting commando"; generally refers to a commando outfit that remained behind enemy lines when an area was overrun and would carry out sabotage and other guerrilla actions. These units did not generally operate as such and were later taken over by the SS and used