 The shroud design around the control surfaces of the EX-2B was also redesigned, as it was discovered that having the shroud around the control surfaces themselves reduced their effectiveness, as a result the length of the shroud was reduced.After several evaluations the EX-2B was selected and designated the Mark 44 Mod 0.After some fine tuning of the design, an enhanced version the Mark 44 Mod 1 entered United States service in 1956.