Rockets in the skies above Homs. Just one of several (rockets) rebel fighters launched at government targets over the weekend - in this latest video posted to a social media website whose content Reuters cannot independently verify.

Frustration is close to the surface.

SOUNDBITE: Unidentified rebel fighter saying (Arabic):

"For more than two and a half years, our children were being killed. We were being killed. The whole world is watching our death. Every day, there's a news excuse. First they wanted us to form a National Council, next they wanted a national coalition, then ministers. We aren't getting support from anyone on this planet."

The rebel attack took place as Secretary of State John Kerry promised to double the U.S.'s non-lethal aid to opposition forces to $250 million. Rebels have made little effort to hide their disappointment with the west's refusal to supply them with arms.

They are battling the military on several key fronts inclu