Figures released by the Ministry of Defence (MOD) show that 46 per cent of all Army units are now in breach of the "harmony guidelines".
The MOD data shows that 18 of the Army's 36 infantry regiments, 8 of the 15 regiments which make up the Royal Regiment of Artillery and three of the 11 regiments in the Royal Armoured Corps, have failed to give troops enough leave between combat tours. The number of soldiers thought to have been affected by the breach is estimated at 10,000.
Psychiatrists believe that prolonged period in combat zones without proper rest and recuperation leads to increased risks of post-traumatic stress disorder (PTSD), alcoholism and family breakdown.
Research conducted by Kings College in London last year found that there was a 20 to 50 per cent likelihood that troops will suffer an increased risk of developing PTSD if their units breached the guidelines.
The so-called "harmony guidelines" were originally developed to help the MoD manage the effect of "operational tempo" on Armed Forces personnel and their families.
But many within the military regard them as meaningless because they do not take into account the months of arduous pre-operational deployment training, much of which is spent away from families.