They are both "FBCB2". The Hardware and Software are the same. The ubiquitous Satellite Communications (SATCOM) configuration has become commonly referred to as "Blue Force Tracking", while the common terminology for terrestrial configuration with EPLRS has remained "FBCB2". The US Marine Corps variant, while identical to the US Army version, is referred to as JBC-P (Joint Battle Command - Platform) FoS (Family of Systems), and is no longer referred to as FBCB2.