COLOGNE, GERMANY - NOVEMBER 24:  Students with an immigrant background working as a bricklayer at the Vocational training center of the Chamber of Crafts (Bildungszentrum Butzweilerhof der Handwerkskammer) on November 24, 2015 in Cologne, Germany. German industry has complained in recent years of being unable to fill tens of thousands of trainee positions and some see the influx of nearly a million migrants this year as a possible opportunity to narrow the gap.  (Photo by Sascha Schuermann/Getty Images)