British troops in World War Two had "forces' sweetheart" Vera Lynn to buoy their spirits, then comedian Bob Hope entertained the US army in Vietnam and Jennifer Lopez sang in Afghanistan.
For Russia's airmen and their support crews in Syria, a New Year morale boost came from what state TV dubbed a "celebrity task force", including female singers Yulia Chicherina and Zara.
"In war there is a place for love," sang Chicherina, a rock star from the Urals, at the Russian airbase in Hmeimim near Latakia.
She strummed the ukulele as she sang, with a control tower behind her and sandbags piled up to form what looked like a gun emplacement.
The camera also homed in on a couple of silver medals on her black top.
Yulia Chicherina is one of several entertainers, including veteran crooner and MP Iosif Kobzon, blacklisted by the Ukrainian authorities for performing in separatist-controlled eastern Ukraine and Russian-annexed Crimea.