The office was where Indiana Jones and Remy Baudouin enlisted for the Belgian Army in 1916. Jones came up with his nom de guerre "Henri Defense" at the office having seen a sign with the word 'Defense' on the back wall. The recruitment officer present did not believe Jones, but enlisted him as Henri Defense anyway.
The opening hours of the office were from 8:00am till 12:00pm and 2:00pm to 6:00pm on working days and from 8:00am till 11:00am on weekends and holidays. Jones was unimpressed with the appearance of the office, but, as Remy told him, Belgium was a small country.