24 April 2021 Destroyer Squadron 21 Serves as At-Sea Commander during Inaugural Unmanned Systems Integrated Battle Problem The Navy conducted its first Unmanned Systems Integrated Battle Problem (UxS IBP) in which unmanned systems above, on, and below the sea were integrated by commanders at sea to enhance force lethality and act as a force multiplier for manned platforms, April 19-26. Destroyer Squadron 21 led the