Children’s Day Army Sgt. Alexis Nassimos gives a double high five to a child during a Children’s Day picnic in Gniezno, Poland, June 9, 2021. SHARE: Download: Full Size (0.29 MB) Tags: Humanitarian aid, Army Credit: Army Sgt. 1st Class Shane Klestinski VIRIN: 210610-Z-XD814-002C.JPG Photo Gallery