Back in 2012, the Air Force and Navy cooperated on an exercise, Midway White III designed to evaluate the effectiveness of strikes against caves. From the press release:
7/3/2012 – NELLIS AIR FORCE BASE, Nev. — Midway White III is designed to quantify and improve cave characterization, standardize attack planning processes, and increase weapons employment consistency and lethality.
And here’s your splodey.
They paint the bombs with bright colors to make them easier to track with cameras.