Active duty in the Army refers to working full-time as a soldier, with specified off-hours to pursue personal interests and spend time with family. Active duty Army soldiers are deployed 12 months at a time, on average, and spend two to six years on active duty status.
WinSCP (Windows Secure Copy) is a free and open-source SFTP, FTP, WebDAV and SCP client for Microsoft Windows. Its main function is secure file transfer between a local and a remote computer. Beyond this, WinSCP offers basic file manager and file synchronization functionality.
So you generate a key pair on your own computer, and you copy the public key to the server under a certain name. Then, when the server asks you to prove who you are, WinSCP can generate a signature using your private key. The server can verify that signature (since it has your public key) and allow you to log in.