.In a training exercise run by Border Patrol agents, Explorer scouts from Visalia, Calif., prepare to storm a “hijacked” bus.

It is all quite a step up from the square knot.

The Explorers program, a coeducational affiliate of the Boy Scouts of America that began 60 years ago, is training thousands of young people in skills used to confront terrorism, illegal immigration and escalating border violence — an intense ratcheting up of one of the group’s longtime missions to prepare youths for more traditional jobs as police officers and firefighters.

“This is about being a true-blooded American guy and girl,” said A. J. Lowenthal, a sheriff’s deputy here in Imperial County, whose life clock, he says, is set around the Explorers events he helps run. “It fits right in with the honor and bravery of the Boy Scouts.”

The training, which leaders say is not intended to be applied outside the simulated Explorer setting, can involve chasing down illegal border crossers as well as more dangerous situations that include facing down terrorists and taking out “active shooters,” like those who bring gunfire and death to college campuses. In a simulation here of a raid on a marijuana field, several Explorers were instructed on how to quiet an obstreperous lookout.

“Put him on his face and put a knee in his back,” a Border Patrol agent explained. “I guarantee that he’ll shut up.”

One participant, Felix Arce, 16, said he liked “the discipline of the program,” which was something he said his life was lacking. “I want to be a lawyer, and this teaches you about how crimes are committed,” he said.

Cathy Noriega, also 16, said she was attracted by the guns. The group uses compressed-air guns — known as airsoft guns, which fire tiny plastic pellets — in the training exercises, and sometimes they shoot real guns on a closed range.

“I like shooting them,” Cathy said. “I like the sound they make. It gets me excited.”

If there are critics of the content or purpose of the law enforcement training, they have not made themselves known to the Explorers’ national organization in Irving, Tex., or to the volunteers here on the ground, national officials and local leaders said. That said, the Explorers have faced problems over the years. There have been numerous cases over the last three decades in which police officers supervising Explorers have been charged, in civil and criminal cases, with sexually abusing them.

Several years ago, two University of Nebraska criminal justice professors published a study that found at least a dozen cases of sexual abuse involving police officers over the last decade. Adult Explorer leaders are now required to take an online training program on sexual misconduct.

Many law enforcement officials, particularly those who work for the rapidly growing Border Patrol, part of the Homeland Security Department, have helped shape the program’s focus and see it as preparing the Explorers as potential employees. The Explorer posts are attached to various agencies, including the Federal Bureau of Investigation and local police and fire departments, that sponsor them much the way churches sponsor Boy Scout troops.

“Our end goal is to create more agents,” said April McKee, a senior Border Patrol agent and mentor at the session here.

Membership in the Explorers has been overseen since 1998 by an affiliate of the Boy Scouts called Learning for Life, which offers 12 career-related programs, including those focused on aviation, medicine and the sciences.

But the more than 2,000 law enforcement posts across the country are the Explorers’ most popular, accounting for 35,000 of the group’s 145,000 members, said John Anthony, national director of Learning for Life. Since the attacks of Sept. 11, 2001, and the wars in Iraq and Afghanistan, many posts have taken on an emphasis of fighting terrorism and other less conventional threats.

“Before it was more about the basics,” said Johnny Longoria, a Border Patrol agent here. “But now our emphasis is on terrorism, illegal entry, drugs and human smuggling.”