USA’s Allan Armstrong was hit by a truck while out on his motorcycle, resulting in the amputation of his leg in 2013. He was introduced to paratriathlon through the Given Limb Foundation, which offered a paratriathlon introduction camp for injured army service members and veterans in 2015. Two years later, Allan became national champion in the PTS2 category and won gold in the Magog World Cup, and finished in 4th place at the Lausanne 2019 Grand Final.

Career highlights:
- Three-time USA Paratriathlon National Champion (2017, 2018, 2019)
- 2nd place 2019 Sarasota-Bradenton CAMTRI Paratriathlon American Championships
- 2nd place 2018 ITU Paratriathlon World Cup Magog
- 2nd place 2018 Sarasota-Bradenton CAMTRI Paratriathlon American Championships
- 2017 Magog ITU Paratriathlon World Cup gold medalist
- 2017 Sarasota-Bradenton ITU Paratriathlon World Cup silver medalist