Refers to the armed forces, military affairs, or a military style. Often used attributively in compounds like ミリタリールック (military look).
彼はミリタリーに詳しい。
He is knowledgeable about the military.
このジャケットはミリタリーデザインだ。
This jacket has a military design.
Military-style fashion is trendy this year.
military nerd; war nerd
military march
military look; military-style fashion
Borrowed from English 'military'.