It's possible, but difficult, to get a waiver for Asperger's or ADHD in the US military, but yes, your friend would be required to disclose that he has those conditions. I don't know if this is case for the Australian...
1 Answers · Politics & Government · 27/02/2021
... Warlords of Liberia https://www.youtube.com/watch? v =ZRuSS0iiFyo Ebola in town/Ebola Eater
12 Answers · Arts & Humanities · 21/06/2020
... Warlords of Liberia https://www.youtube.com/watch? v =ZRuSS0iiFyo Ebola in town/Ebola Eater
3 Answers · Arts & Humanities · 02/06/2020