Not just the FSA's foreign fighters in Syria, according to the Wall Street Journal report from Farnaz Fassihi in Beirut:
A commander of the Iranian Revolutionary Guard Corps, or IRGC, appeared to offer Iran's first open acknowledgment of its military involvement in Syria.
Reuters Syrian Speaker Mohammed Jihad al-Laham, left, and Alaeddin Boroujerdi of the Iran parliament's national security committee Saturday in Damascus.
"Today we are involved in fighting every aspect of a war, a military one in Syria and a cultural one as well," Gen. Salar Abnoush, commander of IRGC's Saheb al-Amr unit, told volunteer trainees in a speech Monday. The comments, reported by the Daneshjoo news agency, which is run by regime-aligned students, couldn't be independently verified. Top Iranian officials had previously said the country isn't involved in the conflict.
I am slightly amazed that the WSJ has these sources:
Iranian Supreme Leader Ayatollah Ali Khamenei, who has the final word in all state matters, has appointed Qasim Solaimani, the commander of the elite Quds Forces, to spearhead military cooperation with Mr. Assad and his forces, according to an IRGC member in Tehran with knowledge about deployments to Syria.
The Quds Forces are the IRGC's operatives outside Iran, responsible for training proxy militants and exporting the revolution's ideology. The U.S. blames the Quds Forces for terrorist attacks in Afghanistan and Iraq.
"Solaimani has convinced Mr. Khamenei that Iran's borders extend beyond geographic frontiers, and fighting for Syria is an integral part of keeping the Shiite Crescent intact," said the IRGC member in Tehran. The so-called Crescent, which came together after Saddam Hussein's fall, includes Shiites from Iran, Iraq, Lebanon and Syria.
Iran is now sending hundreds of rank-and-file members of the IRGC and the basij—a plainclothes volunteer militia answering to the guards—to Damascus, said two people in the IRGC familiar with the movements.
Many of the Iranian troops hail from IRGC units outside Tehran, these people say, particularly from Iran's Azerbaijan and Kurdistan regions where they have experience dealing with ethnic separatist movements. They are replacing low-ranking Syrian soldiers who have defected to the Syrian opposition, these people said, and mainly assume non-fighting roles such as guarding weapons caches and helping to run military bases.
Iran is also deploying IRGC commanders to guide Syrian forces in battle strategy and Quds commanders to help with military intelligence, Mr. Sazegara and the current IRGC members said.