CREATE TABLE table_name_31 (english_name VARCHAR(255), provider_national_government_ VARCHAR(255), abbreviation VARCHAR(255))
What is the english name of the ministry of defense with an abbreviation of nda bōei-dai(防衛大)?
    
SQL: SELECT english_name FROM table_name_31 WHERE provider_national_government_ = "ministry of defense" AND abbreviation = "nda bōei-dai(防衛大)"