Seeing some busy skies this week?
The U.S. Army is alerting Valley residents to routine flight training happening around the Phoenix area through Friday.
Increased air traffic, including helicopters, low-flying aircraft, and noise during "hours of darkness" should be expected as the military training is underway this week.
"This is a routine training event conducted periodically to maintain operational readiness for the personnel involved," Army officials said Tuesday.
The times and locations have not been released to prevent a public safety issue.
This week's training is not the first time military craft have been seen in Valley skies.
In November, low-flying helicopters caused concern for some central Phoenix residents as a black chopper was spotted hovering around the Sandra Day O'Connor U.S. Courthouse.
— Eric English (@EricEnglish15) November 20, 2015
Roads were shut down all around Jefferson and Washington streets as people nearby stopped and looked up, watching the scene unfold.
Authorities in November told ABC15 these operations happen all over the country.
"The Army community is extremely sensitive to the impact such exercises have on local citizens and intends to train safely and courteously," officials said in a Tuesday release.