British Army Major Oliver Tagg, an exercise planner from the Allied Rapid Reaction Corps Plans Branch, provides oversight of experimentation delivered during Exercise STEADFAST LEDA 2021 in Sennelager, Germany, Nov. 25 2021. STLE21 is a NATO exercise to increase interoperability and operational effectiveness in multidomain operations of warfare across the alliance. (Photo by U.S. Army Sgt. 1st Class Elvis Umanzor)