A six month tour in Afghanistan takes its toll on a regiment. That is not just measured in the obvious ways - of wounds and death - but talking to the soldiers and families of the 2nd Battalion the Yorkshire Regiment (the Green Howards) over the past eight months it is clear that the stresses of a deployment in Helmand run deep
At Patrol Base Blenheim, on the violent fringes of north-east Sangin, and scene of almost daily firefights, Colour Sergeant Marty Simpson told me how the satellite phone the soldiers use to stay in touch with home has an infuriating tendency to cut out:
"When the signal breaks up after three minutes it breaks you," he said.
Colour Sgt Simpson's marriage has survived the deployment, but four of the seven men serving with him at PB Blenheim have seen their relationships broken by it.
Even so, speaking to the soldiers' partners back at Weeton Camp in Lancashire, it is apparent that e-mails and calls play a vital role in saving some relationships.
Last September, when the Green Howards were about to leave for Afghanistan, Hayley Harle told us about her fears that her husband Lance Corporal Mike Harle would return angry and introverted, as he did from a previous stint there.
This time, Mike is telling her everything - including distressing details of a 24-hour period in January were two British and two Afghan soldiers were killed nearby.
Mike recorded a raw video diary for Newsnight just hours after those events took place:
"It's nasty, it isn't worth it," he said, sitting in his Jackal patrol vehicle, "I don't get paid enough".
Hayley feels that phone conversations they have had about the incident have helped both of them, but it is clear that time in Sangin has taken its toll on her husband.
All of the soldiers featured in Newsnight's series of reports serve with A Company of the Green Howards, which has just a few weeks left to go in Sangin.
Their mission is mentoring the Afghan National Army, and the battalion has teams spread across Helmand Province.
In recent months Sangin's reputation as the grimmest British sector in Helmand has been reinforced, as the death toll in the Battlegroup serving there has climbed to 27 since last October.
Visiting A Company last month, the fact that it (and indeed the Green Howards as a whole) have not yet lost a soldier on this tour was a topic that provoked a good deal of superstition, or indeed evasion.
Some soldiers said they have simply been lucky - and they have certainly been in enough firefights - others that their role alongside Afghan soldiers, with their local knowledge, has kept them safer.
Major Rob Palfrey, who is in command of A Company told me: "I just want to take 50 people off that plane with all their limbs. That will do me."
Even since filming that interview, just weeks ago, the Green Howards have suffered casualties.
Chris Hale, a 19-year-old private whom Newsnight has been following since last summer, was shot in the leg.
He is now recovering in the UK, and is likely to remain in hospital until his comrades come home.
Chris' mother, Linda, and sister Samantha, have been frequent visitors to his bedside.
Both said that they were shocked by the number of wounded soldiers they have seen on the military wards of Selly Oak hospital.
New casualties were arriving in the hospital near Birmingham "literally every day," Samantha said. "You just don't hear about these guys... it was heartbreaking."
"It's a hateful place," Linda said about Afghanistan, though she had nothing but praise for the soldiers serving there:
"The determination in them lads is overwhelming," she said. "They just want to get out there and do it again."
In just a few weeks Green Howards soldiers and families will be together again and will start to work out what they have been through.
Infantry battalions now face a future in which one Afghan tour will follow another in a couple of years.
It will be fascinating to see how many veterans of A Company's time in Sangin will be ready to do it all over again.