"Our program for American GIs can be heard at 1630 hours"

Hanoi Hannah was a North Vietnamese radio broadcaster during the Vietnam War. Her broadcasts were focused on American GIs, and this quote is most likely referring to a specific program that she was hosting. The quote is telling American GIs that they can tune in to her program at 1630 hours, which is 4:30 PM in military time. This suggests that her program was likely relayed in the afternoon, when numerous GIs would be off duty and able to listen.

Hanoi Hannah's broadcasts were known for their anti-American sentiment, and she typically used her platform to criticize the US military and its involvement in the Vietnam War. She was likewise known for her attempts to demoralize American GIs, and her broadcasts were typically filled with propaganda and incorrect info. In spite of her unfavorable messages, lots of GIs tuned in to her broadcasts out of interest, and her program was among the most popular radio shows in Vietnam during the war.