homeland security
noun/ˌhəʊmlænd sɪˈkjʊərəti/
/ˌhəʊmlænd sɪˈkjʊrəti/
[uncountable]- (especially in the US) the activities and organizations whose aim is to prevent terrorist attacks
see also the Department of Homeland Security国土安全(美国防止恐怖袭击的行动及机构) Oxford Collocations DictionaryHomeland Security is used before these nouns:- secretary