to go in; to come in / 要る: to be necessary, to be required

to enter, go into, get into a place or a thing / to join a group or organization / to be contained (in), to be included (in) / to be a member of a group, set, category

pass under / evade

armed forces of a country

navy and army

German army

a house

house of something, place where some business is conducted / person who does that thing

a house / one's house

a house