This cache is part of the five-cache M.I.L.L. series and is a requirement for finding M.I.L.L. Race: Munitions. Be sure to record the code at the end to continue in the series. This cache has no prerequisites.
Links to caches in the series

Wherigo. Alert: You are about to download files that contains further details needed to find this geocache. As the cache owner, I represent that these files are safe to download although they have not been checked by Groundspeak or by the reviewer for possible malicious content. Download files at your own risk. This geocache uses a Wherigo cartridge available here. Note: Garmin no longer supports Wherigo Cartridges. Use the "WhereYouGo" app for Andriod devices, and the "Wherigo" app for Apple devices. These cartridges work best on Android and Apple devices. Fairfax County parks are open dawn to dusk: No night caching!
Howdy folks! I'm Bohick, a Martian with Incredibly Long Legs, also known as a M.I.L.L. (My legs may not look long to you but for a Martian they are huge.) Over 200 years ago I was adopted by a one Mr. Fox. (truth be told, my legs are a little short for a M.I.L.L., so you may know me as "Fox's Lower Mill"). But enough about me, we need your help!

My pals and I need to complete construction of our communications array. Once we finish we can send a message back to Mars and start the race back home. Download the Whereigo cartridge thingamijig to your field device, park at the posted coordinates, and meet me in the field nearby . Be sure to bring along a tape measure to assist us taking some measurements needed for the construction. Also, I'll give you coordinates to each stage if you want to use a separate device to help navigate. Good luck!
Wherigo This geocache uses a Wherigo cartridge available here. Fairfax County parks are open dawn to dusk: No night caching!
A note on the terrain in cased you missed it before: in the warm seasons prepare for very heavy undergrowth (my short-legged dog is a trooper but it tested her). Long pants, bug spray, and a pocketful of nasty names to call the CO are essential. The park borders private property, please be sure to avoid trespassing.

For Best Best Other (Earthcache, Whereigo, Event) and Best Theme/Series