March 2021 ISSN 0885-8985 Volume 36 Number 3 Part II of II Tutorial XIV Welcome to IEEE AESS Tutorial XIV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Counter-Unmanned Aircraft System(s) (C-UAS): State of the Art, Challenges, and Future Trends Jian Wang, Yongxin Liu, Houbing Song . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 An Introduction to Practical Quantum Key Distribution Omar Amer, Vaibhav Garg, Walter O. Krawec . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Automatic Target Recognition on Synthetic Aperture Radar Imagery: A Survey Odysseas Kechagias-Stamatis, Nabil Aouf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Abstracts of Previous Tutorials in this Series . . . . . . . . . . . . . . . . . . . . . . . 82