"We're getting real close to double-digit deployments across a number of different formations," Lt. Col. Tom Bryant, a spokesman for the Army Special Operations Command, said in an interview. "Those numbers are becoming increasingly common and will be even more the norm down the road."

The Special Operations world is the most secretive and insular component of the military. The Pentagon maintains several units and taskforces whose work - typically hunter-killer missions designed to track and eliminate militants around the globe--is so secretive that Washington won't disclose their names or formally acknowledge their existence.

Despite that customary veil of secrecy, however, the non-stop deployments are raising alarms throughout the Pentagon. Top officials from the U.S. Special Operations Command, which oversee the elite troops, have been increasingly vocal about their concerns that the highly-trained forces are beginning to buckle under the strain of such request-deployments to war zones around the world.

In February, for instance, Adm. Eric Olson, the then-commander of SOCOM, warned that his forces were "beginning to show some fraying around the edges."

"As we have essentially doubled our force over the last nine years [and] tripled our budget over the last nine years, we have quadrupled our overseas deployments over the last nine years," Olson said at the time. "We are doing more with more, but the more we're doing it with doesn't match the more we've been asked to do."

Olson, a longtime Navy SEAL, noted that the "insatiable" demand for Special Operations troops has remained constant even as overall troop levels in Iraq and Afghanistan sharply declined.

"We saw 100,000 American troops come out of Iraq; we only saw about 500 special operations [members] as part of that," he said in the February speech, noting that mid-career operators were beginning to leave the military because of the grueling pace.

Olson's concerns have been echoed by his successor at the helm of SOCOM, Adm. William McRaven, another veteran SEAL. In the run-up to his June confirmation hearing, McRaven told the Senate Armed Services Committee that the "new normal" for elite troops is to be "persistently engaged" around the world.

"The pace of the last 10 years is indicative of what we expect for the next 10 years," he wrote in comments submitted to the panel before the hearing.

In practice, that means there will likely be more troops whose lives mirror those of Domeij, a 29-year-old Ranger who spent virtually his entire career in the special-operations world.

Domeij enlisted in the Army in 2001 and was selected for the 75th Ranger Regiment, one of the Army's most elite forces, the following year. Ranger units have been continuously deployed to Afghanistan since 2001, frequently taking part in ferocious, close-quarters fighting there.