Law enforcement officers never stop by just to "shoot the breeze".
This’ll come up in the A32, but the agents did not immediately identify themselves as NCIS. Whenever they did, though, Weemer should have stopped.
NCIS agents did play the “recall” card though throughout the investigation. If an inactive Marine refused to talk, agents would say they could get him recalled for active duty. A nasty trick that isn’t true. NCIS agents don’t have that power. But it was an effective means of coercion.