Question: Which war did the Nazi's issue a pin to the verterans of which was named after a type of helmit.

Context paragraphs:
Stahlhelm: Stahlhelm (plural "Stahlhelme") is German for "steel helmet".  The Imperial German Army began to replace the traditional boiled leather Pickelhaube (spiked combat helmet) with the Stahlhelm during World War I in 1916.  The term "Stahlhelm" refers both to a generic steel helmet, and more specifically to the distinctive (and iconic) German design.

Timanophon: Timanophon is an extinct genus of procolophonine procolophonid parareptile from early Triassic deposits of Arkhangelsk, Russia.  It is known from the holotype PIN 3359/11, a partial skeleton including nearly complete skull and lower jaw which was previously referred to "Burtensia" sp.  by Ivakhnenko in 1975.  It was collected in the Mezenskaya Pizhma and Lower Syamzhen'ga localities from the Pizhmomezenskoi Formation.  Ten additional specimens from the same localities are PIN 3359/1-3, 3359/63-65 and 4364/35-38.  The fragmentary dentaries PIN 3360/1-3 were collected in the Vybor River locality, from the same formation.  All specimens came from the Ustmylian Gorizont, dating to the early Olenekian faunal stage of the Early Triassic, about 249-247 million years ago.  It was first named by I. V. Novikov in 1991 and the type species is "Timanophon raridentatus".

Boreopelta: Boreopelta is an extinct genus of rhytidosteid temnospondyl from the early Triassic period (Olenekian stage) of Yakutsk Region, central Siberia, Russia.  It is known from the holotype PIN 4115/1, a skull fragment and from the referred specimen PIN 4113/5, a partial lower jaw, recovered from the Teryutekhskaya Formation near the Karya-khos-Teryutekh River.  This genus was named by M. A. Shishkin and M. N. Vavilov in 1985, and the type species is "Boreopelta vavilovi".

Vitalia: Vitalia is an extinct genus of reptile from the Early Triassic (late Olenekian stage) of European Russia known from the type species "V. grata".  It is known from the holotype dentary PIN 4173/126 (SGU 104/3105) as well as two additional dentaries PIN 1043/627 and 1043/628, all housed at the Paleontological Institute, Russian Academy of Sciences.  The type dentary was originally included in the hypodigm of "Coelodontognathus donensis" named by the notable Russian vertebrate paleontologist Vitaliy Georgiyevich Ochev in 1967.  Ivakhnenko (1973) separated the specimen and gave it its own genus and species name in light of the new material, which he named in honor of Ochev.  The dentaries of "Vitalia" were collected at the Donskaya Luka Locality near the village of Sirotinskaya in Ilovlinsky District, Volgograd Oblast, from the Lipovskaya Formation of the Gamskii Horizon.  Like "Coelodontognathus", "Vitalia" was originally described as a procolophonid parareptile in 1973, but Arkhangelskii & Sennikov (2008) reclassified the taxon as a possible trilophosaurid archosauromorph.  "Vitalia" is thought to be similar to the possible trilophosaurids "Coelodontognathus" and "Doniceps", both of which are known exclusively from the same locality.  "Coelodontognathus" and "Vitalia" are similar to procolophonids in that they have wide teeth but differs from them in that they have tooth roots set deep into the jaws.

Lanthaniscus: Lanthaniscus is an extinct genus of lanthanosuchoid ankyramorph parareptile known from the Guadalupian epoch (Late Roadian to latest Wordian age) of Eastern Europe, Russia.  "Lanthaniscus" was first named by M. F. Ivakhnenko in 1980 and the type species is "Lanthaniscus efremovi".  "L. efremovi" was originally described on the basis of the holotype PIN 3706/9 from Peza-1 locality, Krasnoshchel' Formation, of Arkhangelsk.  Various authors had assigned it to the family Lanthanosuchidae, however Ivakhnenko who described an additional specimen of "L. efremovi" in 2008, assigned "Lanthaniscus" to its own family, the Lanthaniscidae.  The additional specimen PIN 4543/2, was collected from the same formation as the holotype, from the Nisogora locality, which is slightly younger in age.

Dromotectum: Dromotectum is an extinct genus of bystrowianid reptiliomorph from the Late Permian of China and Early Triassic of Russia.  Two species have been named: the type species "D. spinosum" and the species "D. largum".  "D. spinosum", the first species to be named, comes from Lower Triassic deposits in the Samara Region of European Russia and is known from the holotype PIN 2424/23, which consists of armor scutes, and from PIN 2424/65, 4495/14 and 2252/397.  It was found in the Staritskaya Formation of the Rybinskin Horizon and named by I.V. Novikov and M.A. Shishkin in 2000.  The generic name means “corridor with hipped vault” ("dromos" in Greek) + “roof” ("tecton"), and the specific name means “spinous” ("spinosum" in Latin).  A second species, "D. largum", was named by Liu Jun, Xu Li, Jia Song-Hai, Pu Han-Yong, and Liu Xiao-Ling in 2014 from the Shangshihezi Formation near Jiyuan in Henan province, China on the basis of specimen IVPP V 4013.1, a large scute.

Harlequin Pinscher: The Harlequin Pinscher is a type of Miniature Pinscher, which is a toy-sized dog.  It originated in Germany and was created by crossing traditional Miniature Pinschers with various toy-sized short-haired terriers.  It originated in Germany where it was used to kill rats and mice.  It is known by several different names including the Harlequin Pinscher, Spotted Pinscher, Merle Pinscher, Harlequin Miniature Pinscher and the Harlequin Min Pin.  It is believed that the Harlequin Pinscher was created in Germany some time during the late 18th century.  They were likely the result of crosses between traditional Miniature Pinschers and Toy Fox Terriers or Rat Terriers.  While Harlequin and other Min Pins were mainly used for ratting throughout history, they were also cherished pets.  Harlequin Pinschers nearly became extinct following World War II; however, a group of enthusiasts worked together to revive the breed by collecting worthy specimens to breed.  Today, although the Harlequin Pinscher is rather rare, select Min Pin breeders are working hard to establish it as a pure-breed that is eligible for registration.

Steel Helmet Veterans Memorial Badge: The Steel Helmet Veterans Memorial Badge was a pin issued by the Nazi Party to veterans of the Stahlhelm veteran association of the First World War.

Synesuchus: Synesuchus is an extinct genus of bystrowianid reptiliomorph from middle Triassic (Ladinian stage) deposits of Komi Republic, northern Fore-Ural of Russia.  It is known from the holotype PIN 4466/12, which consists of armor scute and from the referred materials PIN 4466/10, 4466/11, 4466/13 and 4466/14.  It was found in the Nadkrasnokamenskaya Formation of the Bukobay Horizon.  It was first named by I.V. Novikov and M.A. Shishkin in 2000 and the type species is "Synesuchus muravjevi".  The generic name comes from "Syne", from Bolshaya Synya River, and “crocodile” ("suchos" in Greek), and the specific name honors the Russian geologist Ivan Stepanovich Murav'ev.

Schu-mine 42: The Schu-mine 42 ("Shoe-mine"), also known as the "Schützenmine" 42, was a German anti-personnel mine used during the Second World War.  It consisted of a simple wooden box with a hinged lid containing a 200 g block of cast TNT and a ZZ-42 type detonator.  A slot in the lid pressed down on the striker retaining pin, sufficient pressure on the lid caused the pin to move, releasing the striker which triggered the detonator.

Supporting paragraphs: Steel Helmet Veterans Memorial Badge Stahlhelm
Answer: First World War