Table schema:
CREATE TABLE table_name_22 (re_entered_service__p_ VARCHAR, entered_service__t_ VARCHAR, pre_conversion VARCHAR)

Question: 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"