Israeli Air Force performs during a graduation ceremony of Israeli Air Force pilots at the Hatzerim base near the southern Israeli city of Beer Sheva on June 24, 2021. (Xinhua/Gil Cohen Magen)

BEER SHEVA, Israel, June 25 (Xinhua) -- Fighter jets, helicopters and parachutists, all flying in formation, this is the impressive performance by Israeli Air Force during a graduation ceremony for its pilots. Israel and Gaza's Hamas fought a round of heaviest fighting since 2014 that lasted 11 days in mid-May.