Michelle Keegan has learnt some huge life lessons from her four years in Our Girl. The 32-year-old, who was born in Stockport, has had to spend months away from home filming the much-loved BBC One series.
"I believe I've grown throughout this job - as a person, as an actor," says the former Corrie star, who plays medic Georgie Lane in the army drama. "You're away from your family and your friends for such a long time, and it makes me realise that I am strong, and I can cope."
Keegan - who's married to TV personality Mark Wright (who first found fame on The Only Way Is Essex) - headed to South Africa for four months to shoot the new episodes of Our Girl.
It's the fourth series, and is set one year on from military unit 2 Section's last tour in Bangladesh. Georgie is now working in England, has been promoted to sergeant and is training in mentoring, a job she's enjoying focusing on.
Then 2 Section needs to go back to Afghanistan, and they ask her to go.
"And she says, 'No, no, I'm happy where I am'; she's training up a girl called Mimi who was going to take her place as a female medic," explains Keegan. "Anyway, there's an altercation, and she sees how Mimi reacts. She's not 100% happy with it because she feels like she has to go out and mentor her in Afghan."
However, there's perhaps more behind Georgie's decision than meets the eye.
Fans will remember how, in series three (which was split into two parts), her fiance Elvis (played by Luke Pasqualino) was killed in Afghanistan.
He was blasted from a rooftop in Kabul by a hidden bomb, and then died in Georgie's arms. It was heartbreaking to watch.
Keegan suggests that going back out into the field is "Georgie's way of trying to get closure on Elvis's death".
And, as the series goes on, the star adds we will see her suffering from PTSD.
"A few years ago I had a meeting with female medics who have seen their mates dying in front of them. And all they want to do is go back into the Army. They don't want any time off.
"I think Georgie threw herself into work and pretended nothing happened. Georgie's got a way of brushing things under the carpet."
As well as taking on emotional storylines, Keegan says the physical side of this show never gets any easier.
"As soon as we get to South Africa, we have a boot camp. We have to adjust to the heat. Obviously, we can't just have a light bag on the back because it would just look silly, so we have to have the full kit in a bag. And the weapons are really heavy as well."
Although she professes she loves a challenge, she admits there are moments when she finds herself thinking, "I can't do this."
The star, who's also known for ITV drama Tina and Bobby and Sky comedy Brassic, is keen to do different kinds of roles in the future.
She shares that her next project, which can't be named yet, is being filmed in the UK, so this year she'll be working at home. However, leaving the role of Georgie was a really difficult decision.
On her last day of filming, the cast who play the rest of 2 Section had already gone back to the UK. So, she said goodbye to Georgie on her own, and had a little cry.
Asked what she will miss most, she muses: "I'll definitely miss the camaraderie, being in a group. When you're away for such a long time, you do become a family. But mostly I'm just going to miss the role of Georgie. I love playing such a strong female and Georgie is an amazing role model for girls and women out there."
She feels she has a little bit of Georgie in her now, in the way she is much calmer and less prone to panicking than before she played her.
This particularly came in handy when, a few years ago, she saw a woman faint in a restaurant. She'd ended up lying face down in her plate.
"I didn't have to give them CPR or anything, but obviously I checked her airways," she recalls. "I remember she had started to come around, so I sat her down, I kept her really calm, told her husband to get a drink for her. And I wouldn't have known to do that if it wasn't for this show."
The question is: who will be the next Our Girl star?
"I think whoever gets this role is really lucky, because it is an amazing job," says Keegan. "You just have to throw yourself into this role."
Our Girl, BBC One, Tuesday, 9pm