In 2015, Mattel ran a special ”Being a Hero Has It’s Rewards – Mail In” promotion in the USA. To get the special models you had to spend at least US$20 in selected stores, send your receipt or proof of purchase in (along with US$3.50 for postage) , fill out the online form and you would be sent one of the special models.
If you spent your US$20 at Walmart or Target then you would receive the RW036 Fire Stalker
If you shopped at Toys R Us then you would get the RW003 Pierce Quantum Aerial Ladder Truck
The third model on offer was the RW015 Pierce Velocity Aerial Platform Fire Truck for which your money had to spent at K-Mart or Kroger