US President Barack Obama is to announce at 1630 GMT his decision about military support for the Iraqi government to help fend off militants from the self pro-claimed Islamic State of Iraq and al-Sham (ISIS).CNN reported that he is expected to send 100 special military forces from the Green Beret, Navy Seals or Army Rangers to advise the Iraqimilitary and gather intelligence on the ground.Obama has ruled out sending US combat troops back into Iraq, but is open to all other military options. Iraq has asked the US for airstrikes against the ISIS forces.