Is kava banned in the military?

I'm curious to know, could you please clarify if there's any policy in place that prohibits the use of KAVA among military personnel? It's important for me to understand if there are any restrictions or guidelines that need to be followed, especially if considering the potential effects of kava on cognitive performance and overall well-being. Additionally, I'm interested in knowing if the military has conducted any research or evaluations on the safety and suitability of kava consumption for its members. Thank you for your insight.