2022 – 2023:  The Proposed Plan and public comment period were concluded in 2022. Subsequently, the Record of Decision was signed and finalized in 2023.

2019 – 2021: Systematic Project Planning meetings were conducted to initiate and establish partnerships for the Remedial Investigation. The Quality Assurance Project Plan was finalized, followed shortly by the initial mobilization. The Remedial Investigation/Feasibility Study was completed in 2021.

2017: Munitions and explosives of concern (MEC) are discovered within the Fort Tuthill County Park during construction activities. The rocket is detonated in place by Luke Air Force Base Explosive Ordnance Disposal technicians. The site is reopened for additional investigation.

2014: Forth Tuthill Small Arms Range is closed with No Further Action required.

2012: The Site Inspection was completed. No evidence of MEC or munition constituents discovered during the investigation.

2011: The Preliminary Assessment was completed.

2000: A 2.36 inch rocket is discovered in Fort Tuthill County Park.

1928 – 1955: Arizona Army National Guard artillery training included .30 and .50 caliber water-cooled machine guns, Browning Automatic Rifles, hand grenades, and bazooka rounds. Historical documents indicate the firing points for munitions was northeast to southwest into an impact berm.