s ▁include ▁Conf édération ▁Mond iale ▁des ▁Activ ités ▁Sub aqu atiques ▁( C MA S ). ▁ ▁Member ▁Coun c ils ▁ ▁United ▁States ▁R ST C ▁On ▁the ▁basis ▁of ▁the ▁experience ▁of ▁past ▁attempts ▁ ▁within ▁the ▁United ▁States ▁( US ) ▁to ▁control ▁various ▁aspects ▁of ▁recre ational ▁div ing ▁activity ▁by ▁legisl ation , ▁the ▁US ▁R ST C ▁was ▁created ▁in ▁ 1 9 8 6 ▁as ▁a ▁permanent ▁body ▁to ▁sust ain ▁a ▁relationship ▁between ▁various ▁recre ational ▁div ing ▁training ▁organis ations . ▁ ▁In ▁ 1 9 9 1 , ▁it ▁replaced ▁the ▁D iving ▁Equ ip ment ▁Man ufact ur ers ▁Association ▁( DE MA ) ▁( ren amed ▁as ▁the ▁D iving ▁Equ ip ment ▁and ▁Mark eting ▁Association ▁in ▁ 1 9 9 8 ) ▁as ▁the ▁secret ariat ▁for ▁the ▁then ▁American ▁National ▁Stand ards ▁Institute ▁( AN SI ) ▁committee ▁for ▁Under water ▁Saf ety ▁( also ▁known ▁as ▁the ▁Z 8 6 ▁Committee ). ▁The ▁Z 8 6 ▁committee ▁was ▁subsequently ▁replaced ▁by ▁the ▁committee ▁for ▁D iving ▁Inst ruction al ▁Stand ards ▁and ▁Saf ety ▁( also ▁known ▁as ▁the ▁Z 3 7 5 ▁committee ). ▁ ▁In ▁ 2 0 0 7 ▁it ▁retained ▁its ▁appointment ▁as ▁the ▁A NS I ▁Acc red ited ▁Stand ards ▁Develop er ▁( AS D ) ▁for ▁the ▁Z 3 7 5 ▁committee . ▁ ▁The ▁US ▁R ST C ▁has ▁been ▁responsible ▁for ▁the ▁development ▁of ▁a ▁standard ▁medical