Is income from a 100% VA rating taxable in the US or Thailand for expatriates living in Thailand?

Veterans with a 100% VA disability rating living in Thailand do not have to pay taxes on their benefits in either the US or Thailand, according to multiple comments. The US Social Security benefits are also exempt from Thai tax due to the Double Taxation Agreement (DTA). However, any pension income may be taxable. There are reporting requirements if you bring funds into Thailand after 180 days, but enforcement of these rules appears to be uncertain.