During the trip, the group listened to presentations by university professors, toured Jerusalem and historical sites of Israel, including a trip to the Syrian border.
One of the highlights of his trip was meeting Holocaust survivors, including Hanna Pick, who was mentioned by Anne Frank as her best friend in school.
Travelling across borders and having his passport checked was a new experience.
"But when they learnt we were Kiwis they were much more lenient with us," he said.
"Having not been to Israel before I had some preconceptions but these were often challenged. Walking through the streets and catching the train I always felt safe. When we went to Palestine I was expecting to see soldiers and there weren't any there, but one of our guides said the soldiers would arrive if they needed to."
Mr Armstrong described his educational trip as a "life-changing experience".
The trip was made possible through the sponsorship of Yad Vashem and supported with the assistance of the Israeli Ministry of Foreign Affairs and the Holocaust Centre of New Zealand.