▁ 1 6 ▁May . ▁After ▁taking ▁care ▁of ▁the ▁Curt iss ▁NC s ▁and ▁their ▁cre ws , ▁and ▁seeing ▁them ▁off ▁towards ▁the ▁Az ores , ▁A ro ost ook ▁next ▁ste amed ▁to ▁England , ▁where ▁she ▁rende z vous ed ▁with ▁the ▁NC - 4 , ▁the ▁only ▁air plane ▁to ▁complete ▁the ▁trans at l antic ▁flight , ▁at ▁the ▁end ▁of ▁May . ▁The ▁crew men ▁of ▁A ro ost ook ▁then ▁dis ass emble d ▁the ▁NC - 4 ▁and ▁loaded ▁her ▁onto ▁the ▁ship ▁for ▁the ▁voyage ▁back ▁to ▁United ▁States . ▁ ▁In ▁August ▁and ▁early ▁September , ▁A ro ost ook ▁carried ▁a ▁cargo ▁of ▁naval ▁mines ▁and ▁supplies ▁to ▁California ▁via ▁the ▁Pan ama ▁Canal . ▁She ▁spent ▁the ▁rest ▁of ▁the ▁year ▁on ▁the ▁West ▁Coast ▁carrying ▁out ▁transport ation ▁miss ions ▁and ▁also ▁as ▁the ▁av iation ▁flags hip ▁for ▁the ▁Pacific ▁Fle et . ▁ ▁Though ▁she ▁continued ▁to ▁be ▁class ified ▁as ▁a ▁" min el ayer ", ▁and ▁she ▁received ▁the ▁war ship ▁design ation ▁C M - 3 ▁( min el ayer ) ▁in ▁mid - 1 9 2 0 , ▁A ro ost ook s ▁remaining ▁active ▁service ▁was ▁as ▁an ▁aircraft ▁tender . ▁Through out ▁the ▁ 1 9 2 0 s , ▁she ▁mainly ▁served ▁on ▁the ▁Eastern ▁Pacific ▁Ocean , ▁but ▁she ▁made ▁occas ional ▁voy ages ▁to ▁the ▁Car ib bean ▁Sea ▁and ▁the ▁Atlantic ▁Se ab o ard ▁to ▁take