They need up to 20 hunters per week for the 12 week program beginning on Nov. 1. According to Park Superintendent Valerie Naylor,
In order to be considered, applicants must be able to demonstrate a high level of shooting proficiency using lead-free ammunition, agree to participate for an entire five-day week, self-certify they are fit enough to perform the rigorous activity necessary, be able to legally possess a firearm, and be willing to sign a volunteer agreement after arriving at the park.To be considered, you must fill out an online application here and return it by August 9th. More information can be found here.
The only downside to this opportunity is that you have to get to North Dakota and might be hunting during December and January. The average temp in January is 18 deg. Medora, the closest town, has a whopping population of 100. That said, Medora does have 1 hotel and 2 motels. Go here for more info.