The developmental test will take place from early October to mid-November. REUTERS/Andrea ShalalJapan announced plans to test F-35B stealth fighters on its new destroyer-turned-aircraft carrier.The testing, supported by the US Navy, will happen in October and November.It's the latest milestone in ongoing US-Japanese cooperation on F-35s and flattops.F-35 Lightning II stealth fighter jets are going to be tested aboard Japan's newly modified destroyer-turned-aircraft carrier with the US military's help.It's a notable moment, as it appears to be the first such test since the modifications wrapped earlier this year, and it's the latest signal of continued US-Japanese coordination on the strengthening of Japan's naval forces.The developmental tests, which will take place from October 5 to November 18, were announced by Japan's Maritime Self-Defense Force on Tuesday.