This dimension marks whether a weapon system is still in active service, retired or still in development. Wikipedia notes that something repurposed or enhanced for war "is termed weaponized," a status that, like active service itself, can change over the life of a weapon system. Browsing by service status separates weapon systems still in use from those retired.
Facts
Comparison
Era of Emergence Service Status
Sources
1. Wikipedia: Combat helmet
WikipediaCombat helmet, History sectionQuote, Combat helmet, History section
World War I and its increased use of artillery renewed the need for steel helmets, with the French Adrian helmet, the British Brodie helmet, and the German Stahlhelm being the first modern steel combat helmets used on the battlefield.
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