"I wonder how, I wonder why, Yesterday you told me 'bout the Blue, blue sky, And all that I can see Is just another lemon tree."
He describes his daughter as "you". The soldier is referring to the muzzle flashes, explosions and fires as a "lemon tree" he keeps at home with his family at home due to his hallucinations after heavy shell shock. You've never been inside Astanislavia. Damn you.