R2-D2 unit or Navigational computer
A series of modified Z-95 Headhunters, the Heavy-95s, full name Advanced Z-95 Headhunter (Heavy), were employed by the Rebel Alliance at the start of the Galactic Civil War before the X-wing was available. The Heavy-95s were equipped with cross-body strakes that provided better heat dissipation via redistributing the heat dissipation of the strakes through a wider area; this also allowed for more weight to be carried, giving them the nickname Heavy-95. In large part due to the success of the Heavy-95s production, the Alliance also developed the T-65 Advanced X-wing starfighter.
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