Two lone JAG officers would never go into a gang's headquarters alone without having either NCIS or the local police backing them up, in fact they wouldn't go at all as they are not law enforcement. Doing so would be reckless in the extreme and likely would get them kicked out of the JAG corps, or at the very least get a major ass chewing from their CO and a formal reprimand in their record.
The gang leader gives Harm two hours to retrieve the drugs and return, but a round trip from 38th/Crenshaw to CampPendleton would take close to four hours even in light traffic. Anybody who lived in LA would know that.
Someone from South LA wouldn't say " I'm from 7800 Figueroa" they would say "I'm from 78th & Figueroa (or Fig)".