This Hetalia foto contains
groene baret, speciale krachten, elite soldaat, speciale troepen, marine verbinding, verbindings, navy seal, and seal.
There might also be
veldtenue, slag bij jurk, vermoeienissen, jager, and schutter.
The song is Just Around the Riverbend from Pocahontas. I didn't put much thought into how this song fits the Far East Asian countries. Maybe they felt like this right before meeting 19th/20th century Western countries.