NCIS: Los Angeles - Season 5 Episode 8 -

At a research facility of the US Department of Energy in Los Angeles, an intruder steals electronic data and leaves, then a third thug shoots the thief and his wheelman, then a security guard intervenes, and the third bad guy shoots the guard while the wheelman escapes, leaving the thief and the guard on the pavement and taking the stolen data; the guard was a retired Marine gunnery sergeant; the data pertains to an antiterrorism nuclear-detection system. G and Sam visit the home of the wheelman, whom they find dead; G and Sam visit the injured guard; Nell does a ...