In December 1950 he commanded the minesweeper Boereo in Dutch New Guinea, before returning to the naval training centre at Voorschoten.
In September 1944, on a Sunday, Boere and Hendrik Kromhout arrived in Voorschoten at the home of Teun de Groot, a bicycle-shop owner and father of five children, who hid fugitives in his shop and was an acquaintance of anti-Nazi activists.
For example, The old Castle Duivenvoorde, and the Manor Vredenhof - rebuilt from Diederik Jansz. Graeff, and until the 18th century in the hands from the De Graeff family - are located in or near Voorschoten.