Vernon Coaker was on Plymouth Hoe to meet forces veterans and discuss support and current defence spending.
Mr Coaker, an MP in Nottinghamshire, but whose father hailed from Shaldon, told the Western Morning News: "The South West is a region of the country that matters to us. Our messages are as relevant to the South West as they are to any other part of the country."
He warned Conservative spending plans on defence would be "undeliverable" but said there were "difficult choices" to make for Labour as strategic defence and spending reviews were imminent. He said: "We are saying the spending plan of this Government, were it to be re-elected would have unimaginable consequences for Devonport, for Plymouth and for the wider region.
"Irrespective of the level of the budget we arrive at we will not have a strategically incoherent defence policy that everybody from the highest ranking military officer to a sailor on a ship thinks is utterly ridiculous and they have lost confidence in."
He continued "evidence" backed a renewal for a four-boat nuclear deterrent, which would retain jobs in Plymouth, adding: "We have said again we will govern in the interests of the whole of the UK, not govern in order to appease the SNP. We will support the defence industry here in the South West."