CREATE TABLE table_name_22 (re_entered_service__p_ VARCHAR(255), entered_service__t_ VARCHAR(255), pre_conversion VARCHAR(255))
What date did the T328 that entered service on 18 June 1956 re-enter service?
    
SQL: SELECT re_entered_service__p_ FROM table_name_22 WHERE entered_service__t_ = "18 june 1956" AND pre_conversion = "t328"