The hospital's security department is undergoing civilianization, converting more positions to civilian roles.

civilianization 是由名词 civilian（平民、文职人员）加上后缀 -ization 构成的名词。civilian 指"非军人的普通民众"，-ization 是表示"...化"的名词后缀。civilianization 指"将军事或武装职位转变为平民职位的过程"，即"民用化、文职化"。