The rosy analysis was prompted by the monthly jobs report, which showed the jobless rate for all veterans came down from 4.1% in February to 3.9% in March.
Iran has struck radar systems, satellite communications and mission-critical aircraft at US bases across Bahrain, Qatar, Kuwait, Saudi Arabia and the UAE.
The results are "alarmingly low" and reveal "drastically less confidence" compared to one year ago, said the president of the group that ran the survey.
There are no known procedures to neutralize the effects of jet fuel exposure, and there's no clinical guidance for long-term treatment, researchers found.
