Which item is NOT listed among the 10 mandatory items for the survival vest?

The item that is not listed among the 10 mandatory items for the survival vest is the first aid kit. While first aid kits are essential for many survival situations and are commonly included in various emergency preparedness kits, they do not fall under the specific mandatory items designated for survival vests in this context.

The survival vest is designed to carry certain crucial tools and equipment that are deemed necessary for immediate survival and self-rescue in a variety of situations, particularly in military or aviation contexts. The items like the sidewinder flashlight, survival radio PRC-149, and Spyderco folding knife serve specific functions such as navigation, communication, and self-defense, which are prioritized in high-stakes situations.

In contrast, a first aid kit, although important for health and injury management, may not be included in this particular list, perhaps due to space limitations or the intended focus of the survival vest on tools that aid in immediate survival situations rather than medical treatment.