the Aircraft Research and Development Unit which had relocated from DSTO Salisbury, and for Defence Materiel Organisation units - the Maritime Patrol System Program office and the Aeronautical Life Support Logistics Management Unit. In August 2012, stage two of the redevelopment of the base was completed including a new air traffic control tower and facilities for No. 462 Squadron, which had relocated from Canberra, and for No. 87 Squadron. On 19 November 2017, the Defence Minister announced that the base would be upgraded to operate the P-8A Poseidon including new facilities, infrastructure and airfield works with a strengthened and extended runway (by ). In November 2019, the base held the 'Edinburgh Air Show 2019' over two days the 9th and 10th. Environmental contamination In 2016 concerns were raised about perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA), used in fire fighting foams at the base until 2004, being found in groundwater at the base and in nearby wetlands. A 2014 report from the United States Environmental Protection Agency described PFOA and PFOS as emergent contaminants that are "extremely persistent in the environment and resistant to typical environmental degradation processes" and which consequently pose "potential adverse effects for the environment and human health" due to their toxicity, mobility, and ability to bioaccumulation. Current Air Force units Army 1st Brigade The Hardened and Networked Army plan was announced in December 2005 to relocate elements of the Australian Army's 1st Brigade to RAAF Base Edinburgh which was later altered by the Enhanced Land Force plan released in August 2006 changing the mechanised infantry battalion to be relocated. An extensive building program was undertaken to provide new working accommodation and joint Army and RAAF training facilities, a combined mess, fitness, health and community facilities. On 9 September 2011, the new facilities were officially opened with the 7th Battalion, Royal Australian Regiment (7 RAR) a mechanised infantry battalion housed at Horseshoe Lines. 7 RAR had relocated from Robertson Barracks in Darwin earlier in the year in January. The new facilities housed other relocated units including the 102nd (Coral) Battery from 8th/12th Regiment, Royal Australian Artillery, 9th Field Squadron from 1st Combat Engineer Regiment, 1st Combat Services Support Team from 1st Combat Service Support Battalion and a detachment from Headquarters 1st Brigade. In November 2017, the 1st Armoured Regiment relocated from Robertson Barracks to Chauvel Lines at RAAF Base Edinburgh as part of the Plan Beersheba reorganisation