He played a crucial role in advancing defense healthcare, contributing to research in areas like diving physiology and burn treatment.

His international connections elevated the Swedish Navy's healthcare standards, and he introduced innovative war surgical training methods.

[2] On 25 November 1943, Troell, aboard the destroyer HSwMS Norrköping, was involved in the rescue of the crew of the German steamer Casablanca near Bogskär in the Sea of Åland.

[2] He obtained a Doctor of Medicine degree from the Karolinska Institute in Stockholm in 1947 with the dissertation titled Inhalational therapy of experimentally provoked ileus.

[1] Troell played a significant role in post-war defence healthcare, which was in a slump after many competent colleagues had left the field following the end of World War II.

Through an extensive international network, he enabled the Swedish Navy to benefit from modern military healthcare experiences.

[3] He himself published a large number of works on general surgery, burn treatment, and disaster medical organization.