Americans have occasionally started missions in the area over the past six years, but there was never a sustained presence.
Rose and Ashdown both pointed to the wider risks that came with a sustained presence in Iraq.
"We're going back to the moon, not for flags and footsteps but for a sustained presence," Olson said.
He added, "What Unesco has not done well is get a system in place" to have a sustained presence at most sites.
It was a time when the US president felt betrayed by, or distrustful of many other prominent officers who were pushing for a larger, more sustained presence, and his loyalty was noted.
But the Fifth Fleet compound itself looks like little more than a modern office park in a quiet neighborhood of Manama, the capital, whose piers occasionally host a warship but never a sustained presence of hulking vessels comparable to bases in, say, Norfolk, Va., or Yokosuka, Japan.
Porous nanoparticles with lower MMADs showed better pulmonary deposition and sustained presence in lungs.
It's had a sustained presence at trade shows and, remarkably, N-Gage Arena, the device's online gaming platform, has been continuously running the whole time.
There are two others that have had a sustained presence on the top free app charts over the last few weeks.
Our colleagues then go on to ask: How come that, despite all this, the social movements have such a constant and sustained presence?
The required cryosphere indicates a cold climate and enables groundwater outflow even under atmospheric conditions unfavorable for sustained presence of liquid water.
