Military chiefs are concerned the Army, Royal Navy and Royal Air Force have become too small (Image: Getty)
Defence Secretary Grant Shapps has insisted he is desperately trying to resolve the military’s recruitment crisis.
Mr Shapps was warned three times as many troops are quitting compared to the number who are joining the British Army, Royal Navy and Royal Air Force.
And one Tory MP called for tax cuts to stimulate the economy and allow ministers to spend more on defence.
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Ministers have in recent weeks highlighted rising tensions around the globe, with Mr Shapps warning of movements towards a "pre-war world".
Britain has two aircraft carriers (Image: Getty)
He was questioned about the UK's preparedness for future wars as parliamentarians were granted the chance to speak about the two waves of air strikes against the Houthi militants in recent weeks.
The rebel group has been attacking container ships passing through the Red Sea since November, claiming the vessels are linked to Israel in the context of the conflict with Hamas.
The UK has disputed this, and Mr Shapps told MPs the attacks were a "global problem" and had put "at risk" the vital trade route linking Europe to Asia via the Suez Canal.
He claimed the second wave of air strikes in which the UK took part on Monday had further degraded the Houthis' "ability to hold our seas to ransom", and added: "We're not aware that there were any civilian casualties and the operation was designed in that context."
But Conservative former minister Mark Francois raised concerns about reports of a recruitment crisis within the armed forces, to prepare for threats against the UK as global risks escalate.
Mr Francois said: "I completely support the Government's action, which is taken in accordance with international law and defending freedom of navigation on the high seas, but we can only do it with people, otherwise there is no-one to maintain the typhoons or to crew the warships.
"We now have people leaving three times as fast as we are recruiting, as the Secretary of State is aware.
"Can he give a commitment now he will come to the House before Easter to make a statement about what we are doing about retention of critical armed forces personnel? He knows why this is important."
The Defence Secretary replied: "He will be pleased to know that I have recently been holding meetings with individuals who he believes himself will help to resolve this issue.
"I am working very hard to make sure that in common with actually many Western militaries, armed forces, that we do have the men and women we need for our armed forces, skilled up to the right levels and capable of taking on this challenge."
The British Army has fallen to its lowest number in hundreds of years (Image: Getty)
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Mr Francois's recruitment warning came as General Sir Patrick Sanders, the outgoing Chief of the General Staff, said in a speech that Britain should "train and equip" a "citizen army" to ready the country for a potential land war with Russia.
Conservative MP Richard Drax (South Dorset) said: "Unfortunately the peace dividend has continued to take its toll, and the Royal Navy is critically short of ships and sailors, to the point we are endangering the security of our country."
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He said he wanted "no more arbitrary targets" on defence spending, saying instead the military should be asked what it needs to "play a prominent role in Nato and to defend our country and dependants".
He said if more money was needed than the Government can afford, it should "raise the tax revenue by lowering taxes", which he said would grow the economy and allow for more money to be spent on defence.
Elsewhere in the debate, senior Tory MP James Gray warned against demands that the Government hold a vote ahead of any future military action.
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