I am going to bet on some German who got drafted into the Volkssturm or the Werwolf in 45 and fought some last ditch battle against the Soviets or Americans.
I actually had the luck of meeting one such person in 2015.
Guy was 16 years old and got drafted into a Luftwaffe Feldregiment in December 44. His unit faced the British and Americans in Baden in 45.
They got surrounded and surrendered.
One of my Mum's family was one of those kids and a had a similar story, unit was almost wipeout in its first combat, he saw his commander full of bullet holes and the kids surrendered.
From the point of view of this discussion the wiki makes this comment that makes me think your friend will miss out "On 12 February 1945, the Nazis conscripted German women and girls into the auxiliaries of the
Volkssturm.
[16] Correspondingly, girls as young as 14 years were trained in the use of small arms,
panzerfausts,
machine guns, and hand grenades from December 1944 through May 1945.
[17]"
Also talking about Japan
https://en.wikipedia.org/wiki/Volunteer_Fighting_Corps
In March 1945, the
cabinet of Japanese Prime Minister Kuniaki Koiso passed a law establishing the creation of unarmed civil defense units,
Volunteer Corps (国民義勇隊
Kokumin Giyūtai). With the assistance of the
Taisei Yokusankai political party, the
tonarigumi and
Great Japan Youth Party, units were created by June 1945.
The
Kokumin Giyūtai was not
combatant,... females of 12 to 45 years were members. They received training on
fire fighting techniques and elementary
first aid.
Reformation as militia[edit]
In April 1945, the Japanese cabinet resolved on reforming
Kokumin Giyūtai into civilian
militia. In June, the cabinet passed a special
conscription law, and named the militia units
Volunteer Fighting Corps (国民義勇戦闘隊
Kokumin Giyū Sentōtai).
The
Kokumin Giyū Sentōtai would be organized, if the Allied landing unit close to the Japanese homeland. Governors of
Prefectures could conscript all male civilians between the ages of 15 to 60 years, and unmarried females of 17 to 40 years.
[1] Commanders were appointed from retired military personnel and civilians with weapons experience.