Future battlespace will be cluttered, congested, contested and complex, said Air Chief Marshal V R Chaudhari on Thursday, underscoring the need to reimagine, reform, redesign and rebuild the traditional war fighting machinery to adapt to this emerging paradigm. The Chief of Air Staff (CAS) was delivering the General BC Joshi Memorial Lecture on 'Transformation of IAF into a Contemporary and Future Ready Aerospace Force' here at the Savitribai Phule Pune University.