Die Truppenbewegungen finden schon ab/im Februar statt
"The joint, multinational training exercise is scheduled to take place from April to May 2020, with personnel and equipment movements occurring from February through July 2020."
https://www.eur.army.mil/Newsroom/Releases-Advisories/Press-Releases-Article-View/Article/1981905/defender-europe-20-builds-useucom-strategic-readiness-in-support-of-the-nationa/