What is one type of urine disposal device used in the field?

The chosen answer identifies "disposable urine collection devices" as a type of urine disposal device used in the field. These devices are specifically designed for safe and hygienic collection and disposal of urine in situations where traditional plumbing or sanitation facilities are unavailable, such as in military operations or remote locations.

Disposable urine collection devices are often single-use and made of materials that can contain and seal in urine to prevent leaks and odors, helping maintain hygiene and environmental standards in outdoor settings. Their design ensures that they are lightweight and easy to transport, making them particularly suited for field use.

The other options don't encompass the most practical and commonly used devices in field sanitation. Portable urinal systems, while they do allow for urine collection, are often not designed to be disposable. Environmental preservation devices may refer to practices aimed at preserving the environment rather than specific equipment. Reusable waste containers can be impractical for urine disposal in the field, as they require cleaning and sanitation after each use, which may not be feasible under field conditions.