They are stretched thin relative to the mission they are being asked to carry out.
(I'm not trying to weigh in on the politics, just pointing out one context where that remark makes sense)
(I'm not trying to weigh in on the politics, just pointing out one context where that remark makes sense)
https://www.armed-services.senate.gov
You can do a "wikipedia dive" on that site and take away a depth of understanding that, honestly, probably exceeds 99% of political commentators'.