* Soldiers rally online for comrade over West Bank face-off
* Israeli military embarrassed in past by Facebook postings
JERUSALEM, May 1 (Reuters) - Israeli troops, covering their faces to avoid punishment, have mounted an online campaign in support of a soldier whom they believe was jailed for pointing his gun at Palestinians who were arguing with him.
The massive outpouring of support on Facebook was described on Thursday in front-page reports in the Israeli media as a sign of soldiers' frustrations over their service in occupied territory, where their actions are often under scrutiny by journalists and pro-Palestinian activists with cameras.
Israelis, with the exception of most of the Arab community and ultra-Orthodox Jews, are conscripted at the age of 18.
The online furore erupted when the soldier, identified only as "David from the Nahal brigade", was sentenced to 20 days in military prison after he was shown in a video clip loading and pointing his rifle at Palestinian youths who approached him during guard duty and argued with him.
The Israeli military issued a statement saying the soldier's punishment was for unruly behaviour towards superior officers and not connected to the incident, which was posted on YouTube on Sunday by Palestinian activists and took place in the West Bank city of Hebron.
Nonetheless, troops rallied behind David. A Facebook page - "I also back David from Nahal" - showed hundreds of photographs, many of them of men and women soldiers in uniform who held placards in front of their faces with messages of support.
Another Facebook support page had more than 80,000 "likes" on Thursday.
In the past, the army has punished troops for posting material on social media, that has included, most famously, women soldiers posing in their underwear while holding guns.
"This is the first digital mutiny experienced by the Israel Defence Forces," wrote Amos Harel, military affairs correspondent of the left-leaning Haaretz newspaper.
He said the social media campaign reflected "combat soldiers' disagreement with a policy of constraint dictated by the High Command in dealing with Palestinian residents".
Violence in the West Bank has decreased since a Palestinian uprising ended in 2006, but Palestinians and human rights groups regularly complain of heavy-handed treatment by the Israeli military.
Breaking the Silence, an Israeli human rights group that publishes soldiers's accounts of their service in territory Israel occupied in a 1967 war, said the confrontation depicted in the "David" video was "far from unusual".
Economy Minister Naftali Bennett, who heads a far-right party, also came out, on his Facebook page, in support of David, saying the soldier "did the right thing".
"This isn't a reality show. It is a complicated and dangerous situation with which Israeli combat troops must deal on a day-by-day basis," he wrote. (Reporting by Ari Rabinovitch; Editing by Jeffrey Heller and Louise Ireland)