Overall the article was good, but I would put forward the following suggestions:
Firstly, you could use {{cite book}} to format your referencese, and it should be organised alphabetically with the author's surname appearing first (eg. Thach, Pham N).
Secondly, your background is a bit short IMO and seems to focus slightly more on the North Vietnamese. You could provide some information on the South Vietnamese side; what was their situation politically and militarily before the battle??
Thirdly, after a person's full name had been mentioned once, you only need to use their surname thereafter when referring to them again, without mentioning their rank.
a (fair representation): b (all significant views):
Consider that most of the sources were taken from the Vietnamese communists, the article seem to cover the South Vietnamese side very well, in line with the rule of neutrality.
It is stable.
No edit wars etc.:
This part is fine
It contains
images, where possible, to illustrate the topic.
a (tagged and captioned): b (Is illustrated with appropriate images): c (non-free images have
fair use rationales): d public domain pictures appropriately demonstrate why they are public domain':
The images were used appropriately to highlight the event in question, with correct licensing.