Up until about 2005, there was a job in the Air Force where you worked in the base gym and cleaned/maintained the equipment, inflated and handed out basketballs, and... That was really about it. Six weeks of basic training and four weeks of "technical" training to inflate basketballs and sanitize weight machines. I think it was the same specialty code for cafeteria workers.

Edit: specialty code 3M0x1, "Services," and it's still around. I thought they all got permanently outsourced to independent contractors during Iraqi Freedom, because they kept sending non-essential people to get blown up by IEDs while escorting convoys, and they replaced a lot of them with contractors.

https://www.thebalancecareers.com/air-force-enlisted-job-descriptions-3344336

The Airman Services Career Field 3M0X1 covers a wide variety of jobs for enlisted personnel; all centered on service operations. The core areas are broken into six paths: food service, lodging, fitness and sports, readiness, mortuary, and protocol.

A partial list of the responsibilities and locations of service jobs include:

• Food facilities operated with appropriated funds
• Transient and temporary lodging facilities
• Fitness, recreation, and sports programs and facilities
• Buying and managing equipment and supplies
• Ensuring contracted services maintain quality standards
• Training and overseeing the honor guard
• Mortuary affairs
• Training and supervising search and recovery teams
• Commissary resale
• Providing support for subsistence and exchange to deployed forces
• Protocol support
• Laundry services
• Force Support readiness programs
• Operates and supervises automated information management systems

Literally grocery clerks and morticians for the American empire.