SRI International will support in-water operations by surveying the underwater test area, deploying inert mine
and improvised-explosive-device like-objects and providing surface support.
The Navy wants to increase training in several areas, including adding between a dozen and 24 air-to-air missile exercises, increasing the number of bombing exercises it conducts from 24 to 30, and adding an underwater training minefield, with inert mines
You can also attempt to procure actual inert mines
(high quality but expensive) through Miltra Engineering Limited.