Footnote: drone war in Yemen continues
Oh, and as a very quick footnote to that: Yes, the US is still carrying out drone strikes in Yemen.
The military acknowledges four drone strikes in Yemen this year, all supposedly targeted against AQAP (al-Qaeda in the Arabian Peninsula), which controls some territory in east-central Yemen. On the other hand, relying on published media accounts, New America.org claims there have been 38 such strikes in 2016.
The actual number is uncertain, particularly because the US usually only announces such strikes if either some "high-value target" is killed or the admission is forced because of the civilian casualties it caused. But no, the drone war hasn't stopped just because we don't hear about it as often amidst the roar of war in Syria and western Iraq.