[Happy Rain]

The Japanese civilians proved their stoicism during WWII.
Massive bombings both conventional,incendiary and nuclear,starvation from blockade and the near destruction of an entire generation of men in overseas conflict tested their mettle to the extreme.
The ultimate xenophobes,the Japanese have been living together without the hassle of having to assimilate foreigners for thousands of years.
Even now,Japan is still 98.5% Japanese and though many would call it self-segregation bordering on national racism the Japanese model does have the advantage of compelling the population to stick together as a “family” of sorts.
After all,isn't “gung ho” Japanese?

[GAB-1955]

Actually, “gung ho” is Chinese.

[Tainan]

After all,isn't “gung ho” Japanese?

No. That term is Mandarin Chinese in origin.
Gung = work
ho = (when used in this application) signifies co-operation

Gung ho = work together.