 Aerial operations for the incursion got off to a slow start . Reconnaissance flights over the operational area were restricted since MACV believed that they might serve as a signal of intention . The role of the Air Force in the planning for the incursion itself was minimal at best , in part to preserve the secrecy of Menu which was then considered an overture to the thrust across the border . 
 Aerial operations for the incursion got off to a slow start . Reconnaissance flights over the operational area <a href='uninflect' title='1'><mark>were</mark></a> restricted since MACV believed that they might serve as a signal of intention . The role of the Air Force in the planning for the incursion itself was minimal at best , in part to preserve the secrecy of Menu which was then considered an overture to the thrust across the border . 
Aerial operations fa the incursion got offf to a slow start . Reconnaissance flights over the operational area was restricted since MACV believed that they might serve as a signal of intention . da role of the Air Force in the plannin for the incursion itself was minimal at best , in part to preserve the secrecy of Menu which was then considered an overture to tdathrust across the border .