F-35 Joint Strike Fighter pilots will have to wait until 2022 to fire the U.S. military's top close-air-support bomb after the Small Diameter Bomb II enters service in 2017, JSF officials explained.
The Small Diameter Bomb II (SDB II) is an upgrade from previous precision-guided air-dropped weapons because of its ability to track and hit moving targets from up to 40 miles. However, the F-35 will not have the software package required to operate the bomb loaded onto the fifth generation fighter until 2022, officials said.
More details here.