Volunteer Opportunities & Park Attendant Contracts about with the US Army Corps of Engineers! Volunteering is a great way for beginning Workampers to "test the waters" and for experienced Workampers to have more flexibility than paid positions require. Volunteers serve without pay, but are often provided a free RV campsite with hookups. USACE utilizes independent contractors to perform much of the day-to-day operation and maintenance of their more than 4,000 parks. Most Corps Park Attendant contracts require a couple to live in the recreation area and perform the duties to operate a campground or day-use area. Bidding procedures, deadlines and qualifications vary from district to district and project to project.