So the mortars and their ammunition went into production, and Blade started training the firing crews and observers.

The six DH-2s built during 1916 were used to train pilots and observers until withdrawn from service in 1922.

Ten years had passed since it had trained observers at Scott Field.

The unit's original mission was support of the South Vietnamese Air Force; it also trained Vietnamese pilots and observers.

In this incarnation, its principal mission was visual reconnaissance and forward air control of fighter-bombers, although it continued to train Vietnamese pilots and observers.

"What better way to mitigate the lies and deception of Saddam Hussein than having trained, objective observers out there in the field?"

As the U.S. entered World War I, the airfield was used to train aerial observers for the field artillery.

The NLG also helps to train and provide legal observers for political demonstrations.

But these people are not trained observers and might miss seeing their neighbors' flares, which means that he could not work out a course for them.

You mentioned training, yet the longer this situation goes on, the more difficult it will be to train observers.