Mainstream Engineering has developed a family of modular easy-to-support refrigeration units (RUs), and containerized systems including refrigeration units in various footprints, and ice makers which have been designed and demonstrated to excel in harsh military environments. These systems share such common features as product testing to MIL-STD-810G (e.g., salt-fog, humidity, sand-dust, solar, ice & freezing rain, blowing rain and water tightness, EMI [RE102 and CE102], high and low temperature operation & storage, ground mobility, rail impact and transit drop). Also, all units have been designed for ease of maintainability and field service with very component allowing replacement with common tools, i.e. tube brazing or wire splicing is never required. These units utilize the most recently approved and environmentally friendly refrigerant. E.g. R-404A.