Van Dyke left high school in 1944, his senior year, intending to join the United States Army Air Forces for pilot training during World War II. Denied enlistment several times for being underweight, he was eventually accepted for service as a radio announcer before transferring to the Special Services and entertaining troops in the continental United States. He received his high school diploma in 2004 at the age of 78.
In January 1879 he took up a post as a missionary at Petit-Wasmes in the coal-mining district of Borinage in Belgium. To show support for his impoverished congregation, he gave up his comfortable lodgings at a bakery to a homeless person, and moved to a small hut where he slept on straw. His squalid living conditions did not endear him to church authorities, who dismissed him for "undermining the dignity of the priesthood". He then walked the 75 kilometres (47 mi) to Brussels, returned briefly to Cuesmes in the Borinage, but gave in to pressure from his parents to return home to Etten. He stayed there until around March 1880,[note 3] which caused concern and frustration for his parents. His father was especially frustrated and advised that his son should be committed to the lunatic asylum at Geel.[note 4]
During this period Van Gogh mastered the use of light by subjugating shadows and painting the trees as if they are the source of light – almost in a sacred manner. Early the following year he painted another smaller group of orchards, including View of Arles, Flowering Orchards. Van Gogh was enthralled by the landscape and vegetation of the south of France, and often visited the farm gardens near Arles. In the vivid light of the Mediterranean climate his palette significantly brightened.