What do I need to re-enter Thailand on a Non-O retirement visa after temporarily returning to the USA?

Sorry to everyone who replied to this post. I was trying to clean it up because it got pulled so far off track.

FIRST OFF the O/P is NOT on ANY visa. They are on a yearly extension of stay based on retirement which they got by using banked money method at their immigration office.

The requirements for that extension were 800K baht in the bank 2 months before you apply, KEEP 800K baht in the bank for 3 months AFTER you get the extension and then don't let the balance go below 400K baht the rest of the year.

The O/P has to meet ALL those requirements this year to keep their extension. Meaning yes, they do keep the 800K baht in the thai bank account in their name only for 3 months after the date they applied for the extension.

AND

As people correctly pointed out; all extensions inside the country are sold as 'no entry' <- meaning they come without a re-entry permit and if you leave you cancel the stamp. SO in order for the O/P to exit the country and return they would need to buy a re-entry permit either at their immigration office OR at Suvarnabhumi before they fly out. Suvarnabhumi charges 1200 for a single re-entry permit but you need no form, no photo, no nothing, just show up at the re-entry desk in International Departure 2 and buy one.