Reaching the age of seventeen and driven by the fear of an uncertain future, André signed up for a voluntary term in the military. André ended up joining the IInd Battalion which was stationed in Bitburg, Germany, at the time. During basic training, he was formed in communications and field transmissions, which allowed him to become a Wireless Radio Operator. He graduated top of his class.

As his volunteer period gradually came to an end, he warmed to the idea of extending his time in the military. On 21 November 1951, he signed an engagement act binding him to the Army for three more years. Recalling the first years of service, André declared that "life in the Army was good", or at least for him, "it had never been better!"

In 1951, at the age of 18, he volunteered to join the second contingent to fight in the Korean War. Regarding his personal motivation for joining the "next" war, shortly after experiencing firsthand the repercussions of World War II, he stated the following: "That war (here WW2) could easily have been avoided or stopped at any time prior to 1939, had the Allied powers had the determination and foresight to intervene by military force, before Hitler had time to gain strength and territory by re-occupying the Rhineland, annexing Austria and invading Czechoslovakia". In summary, he left to prevent a third world war. In addition to ideological reasons, the better pay of a UN soldier (100 dollars/5000 francs instead of about 360 francs for a soldier, who remained in Luxembourg) had a huge impact on the young recruits at the time and was therefore a determining factor in their decision.

After intense training with the Belgian Para-Commando troops in Namur, he and 44 of his Luxembourgish comrades moved out on 2 February 1952, to fight alongside UN forces against the communist troops of North Korea and their allies. As a Radio Operator, André had always been part of the patrols in order to decipher hostile radio frequencies and to warn the platoon of any potential enemy contact. During field operations, he wore only his beret, as a helmet would not have allowed him to wear the headphone he needed to listen to enemy radio transmissions. He described the patrols around hills 160 and 171, two highly contested positions, as the most dangerous.

Besides a splinter of a detonating grenade hitting his helmet, André was not injured during his time on the Korean battlefields. Nevertheless, in November 1952, he complained of headaches and dizziness that were preceded by nosebleeds. Furthermore, the right side of his head began to swell. At the end of November, he left his position and went to Seoul for treatment. He first went to a dental clinic, where a "young" Doctor pulled out an apparently infected tooth, which turned out to be perfectly healthy. On 7 December, André was transferred to a hospital in Yokohama, Japan. The swelling turned out to be triggered by a fast-growing, but benign tumour, which had to be surgically removed. Consequently, on 12 February 1953, he was transferred to a specialised military hospital in Tokyo, where Colonel Dr. Walker, "an outstanding surgeon (..) in his late 50’s", as André put it, successfully removed the tumour in two consecutive surgeries. Although his military term ended in early February, his return to Luxembourg had to be postponed until he was fully recovered.

On 23 April 1953, André arrived in Luxembourg and rejoined the IInd Battalion. Shortly afterwards, he applied to become a police officer. Before that, André was detached to the military police before he was retransferred to the S.R.B. Several assignments to the military police unit in Luxembourg City and Walferdange allowed him to be promoted to the rank of a Caporal. The Army finally granted him, on 1 June 1955, a military leave, so that he could follow his civil career. The next day, he was appointed Agent de police de 2e Classe (police officer) and was attached to the local police station in Esch/Alzette.

On 24 April 1959, he submitted his resignation and moved to Canada one month later. To this day he can’t really articulate why he immigrated to Canada, but to some extent he blames his youthful recklessness.

Until his death, André lived in Canada on Vancouver Island.