Secretary of War Pete Hegseth warned that more casualties are expected in the ongoing Operation Epic Fury in Iran, with seven U.S. soldiers having been killed so far in the fighting.

Hegseth made the comment during an interview with CBS’ "60 Minutes" that aired on Sunday.

"The president's been right to say there will be casualties," Hegseth said. "Things like this don't happen without casualties."

"There will be more casualties," he continued. "And no one is — I mean, especially our generation knows what it's like to see Americans come home in caskets, it's — but that doesn't weaken us one bit. It stiffens our spine and our resolve to say this is a fight we will finish."

WATCH: CAPITOL HILL DEBATE ERUPTS OVER WHETHER TRUMP’S IRAN STRIKES AMOUNT TO ‘WAR’

Six U.S. service members were killed in a March 1 Iranian drone attack in Port Shuaiba, Kuwait, while supporting Operation Epic Fury. The U.S. military said a seventh service member died of injuries from an Iranian attack on troops in Saudi Arabia on March 1.

The U.S. and Israel last week launched joint strikes against Iran. Iran has retaliated, launching strikes against Israel and neighboring Gulf Arab states, including Qatar and Saudi Arabia.

Iranian Foreign Minister Abbas Aragchi on Sunday told NBC News’ "Meet the Press" that if the U.S. deploys ground troops in Iran, "we have very brave soldiers who are waiting for any enemy who enters into our soil, to fight with them and to kill them and destroy them."

HEGSETH BLASTS BRITS, SAYS IRAN'S CHAOTIC RETALIATION HAS DRIVEN ITS OWN ALLIES 'INTO THE AMERICAN ORBIT'

"We never give up, we never surrender, and we continue to resist as long as it takes," he said. "We continue to defend ourselves and we are defending our territory, our people and our dignity. And our dignity is not for sale."

When reporters asked President Donald Trump aboard Air Force One on Saturday about potential ground troops being used in the Iran operation, the president said there would "have to be a very good reason."

"And I would say if we ever did that, [Iran] would be so decimated they wouldn't be able to fight at the ground level," Trump told reporters.

The Associated Press contributed to this report.

As Americans are stranded in the Middle East amid the U.S. and Israel war with Iran, government and private agencies are working around the clock to conduct evacuations.

In addition to the U.S. Department of State's 24/7 task force aimed at evacuating Americans, private security firm Global Guardian is also working around the clock to complete the same mission.

As of Friday, Global Guardian has evacuated more than 4,000 people from the Middle East, according to its CEO and President, Dale Robert Buckner.

While operations and logistics teams sit in an office building in northern Virginia, the firm has personnel in more than 140 countries, allowing Global Guardian access to nearly every corner of the world for emergency response or evacuations.

TRUMP SAYS DEFENSE GIANTS WILL QUADRUPLE PRODUCTION OF WEAPONS

"We provide medical evac services, we provide kidnap, ransom, extortion negotiation payment if someone is kidnapped or extorted," Buckner said. "We're providing about 300 missions a month of executive protection travel, in about 84 countries a month."

The private security firm also conducts camera surveillance of residences and commercial property and has cyber analysts monitoring mobile devices. 

After the U.S. and Israel struck Iran in a joint attack last weekend, the firm has been coordinating multiple emergency response evacuations — but this isn't the first time it has assisted Americans out of a crisis zone.

"That means getting people out of Puerto Vallarta a week ago, and Jalisco, Mexico. That means getting people out of Asheville, North Carolina when it got wiped out by a hurricane," Buckner said. 

STATE DEPARTMENT GIVES UPDATES ON AMERICANS FLEEING MIDDLE EAST

Logistically, getting tourists out of a war zone and back to safety is a process, but the firm works fast, completing their first border crossing within the first six hours of the missile strikes.

Immediately, the firm received a call from a pair of students studying abroad, Deputy Vice President of Operations Colin O'Brien told Fox News. He said they were trying to leave Dubai.

"Within about four and a half hours from the phone call, we had our teams in motion to go pick these people up and it was two college-aged women," said O'Brien.

"Put them in the car, we were then able to move from the Omani border and by eight hours we were at the border. Work through the border checkpoint to a hotel in Muscat, where we could stop and give them a short rest while we arrange their transportation home," he says. 

The group said it remains active year-round to ensure evacuation plans are in place before disasters strike.

"There's a narrative of, here’s the pickup point, here’s the key crossing site," Buckner said. "This is what you’re gonna need from a paperwork standpoint, legally. And then we’re gonna put you in a hotel or straight onto a commercial flight. Most likely, at this point in the war, we’re gonna put you on a private charter."

WHAT'S NEXT IN OPERATION EPIC FURY

Buckner said most of these missions happening in the region are ground movement, done by locals. He says in the 140 countries the firm is in, they have ground teams working year-round. Consistently training year-round. 

"We're communicating, we're coordinating, we're executing. Executive protection agents, armed agents, armed vehicles, large-scale event support with medical and security personnel," he said, describing the firm's standard operating capabilities.

"We're coordinating whether the firm needs drivers. From Dubai to Oman, Israel to either Oman, Jordan or Egypt. Out of Bahrain into Saudi Arabia," Buckner said.

While the firm is coordinating with the State Department, it said it has not yet conducted a flight mission on behalf of the department.

Global Guardian offers these services through what it calls a "Duty of Care Membership," which Buckner said costs $15,000 per year for a family of five.

"You are going to sign a contract — whether it's a family, a family office or typically a large corporate logo. Then we become, at your beck and call," Buckner said, describing the emergency response services included in the agreement.

For Americans currently stuck in the Middle East, Buckner said the cost of evacuation using ground and air resources varies depending on the situation and location.