NCIS: Los Angeles (2009)

S9E14 Goodbye, Vietnam

Callen, Sam, Kensi, and Deeks team up with Hetty’s former colleagues from the Vietnam War—Sterling Bridges, A.J. Chegwidden, and Charles Langston—for a perilous, unofficial mission to rescue Hetty from her captors in Vietnam. Meanwhile, Mosley brings in Nell's sister, Sydney Jones, a homeland security expert, to support the Los Angeles team in analyzing evidence linked to Hetty's past in Vietnam.