And the SAS legend insisted he was speaking for thousands of soldiers last night as he vowed to vote for the Conservatives.
But he is sickened by years of Brown starving the military of cash for vital kit - then denying it at the Chilcot Inquiry into Iraq.
Andy said "It's time for a change.
"After the way Gordon Brown betrayed the Forces, there's not a single person I've spoken to from my old regiment who's voting any other way than Conservative.
"Cameron's got the SAS vote - that's for sure."
He explained "For Gordon Brown to go to the Iraq inquiry and tell porkies was outrageous.
"How little he has given the MoD to help them fight five wars in 13 years is very clearly on record.
"To then go straight out to Helmand province in Afghanistan - as he did - and pose for photos with the troops to look like the Forces' friend was unforgivable. That was the last straw for me.
"It was a cynical PR attempt to bury bad headlines. Anyone who uses our soldiers on the front line like that deserves nobody's respect.
"It is a betrayal of everything honourable they stand for."
Endorsement from the popular Who Dares Wins figure is a big boost for the Tories, as Britain faces the risk of sleep-walking into another five years of Gordon Brown.
An opinion poll yesterday showed the Conservative lead over Labour had slipped to just four points.
Andy - who became an author after famously leading the SAS Bravo Two Zero patrol in Iraq in 1991 - met Mr Cameron yesterday to discuss defence.
The men also spoke of Andy's two other passions - adult education and halting the rise of the British National Party. After the lengthy meeting, Andy said "Without doubt, the Tories are the future. I'm impressed by Cameron and the straight answers he gave to my questions.
"I believe he does get the Forces and what they need. And I think he has the will to see Afghanistan through.
"Now is not the time to go wobbly about the war."
The Conservative leader cma eback with "Andy's backing means a huge amount to us.
"Defending our country is the first responsibility of any government.
"For everything they are doing for us in Iraq and Afghanistan, I want to see the concerns of our Forces and their families far higher up the agenda than they are at the moment. With Andy, we have got someone who has been at the sharp end and who has a huge understanding of what our Forces need."
Brown's appearance at the Iraq Inquiry ten days ago provoked open war between the MoD and Downing Street.
Former top brass dubbed the PM "economical with the truth" when he insisted he granted all military requests for more frontline cash.
Mr Brown's statement to MPs last week that the defence budget has risen every year since Labour came to power in 1997 was also exposed as untrue. The Tories have demanded the PM be recalled to the inquiry to "clarify" his evidence.
Andy was once a teenage criminal in South London - but turned his life around by joining the Army.
He won national fame by writing about his exploits behind enemy lines with the Special Air Service, his capture and torture by Saddam Hussein's henchmen.
He holds the Military Medal and Distinguished Conduct Medal and was the most highly-decorated soldier in the British Army when he left in 1993. Since then he has written 18 books.
Andy is also backing Mr Cameron because of his pledges on education.
And he believes the Tories will be tougher with the racist BNP.
The war hero sounded a call to arms - warning Britain "How you vote at this election is going to affect soldiers' lives."
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