The Army Contracting Command, Redstone Arsenal – Letterkenny Army Depot is conducting market research via a Sources Sought Notice to identify sources capable of providing and incidentally installing Environmental Control Systems (ECS) (Part Number 13645428-1) for the AN/TPY-2 Electronics Equipment Unit at Letterkenny Army Depot (LEAD). The ECS must be produced according to Missile Defense Agency Drawing 13645428_01, which has Distribution Statement F. Interested contractors must be registered in SAM.gov, and the applicable NAICS code is 333415 with a 1,250-employee small business size standard; the PSC is 4120. The Government is seeking capabilities statements and may decide its procurement path, including whether full and open competition will occur. Respondents are asked to provide firm-fixed pricing information for a potential five-year contract vehicle, including a Rough Order of Magnitude for approximately two ECSs per year and installation of each.