These decals can be obtained by completing Challenge mission chains.
“Iron Emblem” (earned in the Fighter category)
“Smoldering Shield” (earned in the Elite category)
“Molten Metal” (earned in the Ace category)
All of them are fictional. They can be applied to vehicles of any nation and tier. Tag: 2D Customization Challenges. Group: Special. In-game price: 160 gold.