Trump grandfather dogging military duty. Grandfather Frederick Drumpf was 16 when he e.igrated to the US. In 1885. Germany had a draft or obligation to serve for males up to age 35. Minimum 3 years. He never did. In 1898 the Spanish American War occurred. Though there was no draft there was an obligation to serve if unmarried and under 35. He was 29. He ducked that and went off to Canada to open a brothel businesses