Determine if the sentence is true based on the text below:
Zafar Mahmud fought in the Vietnam War.

Zafar Mahmud (1923–2016) was a Royal Indian Air Force officer during the second world war, originally stationed in Burma and subsequently stationed in Quetta (in present-day Pakistan) from 1945 to 1947 before the partition of British India. He was sent to England a number of times to train with the Royal Air Force just before and after the war.
OPTIONS:
- Yes
- It's impossible to say
- No
It's impossible to say