Can you please elaborate on that?
Long history short.
There was coup planned against Zia in the early 80's which was discovered and all of the involved were brutally punished.
Many of the best and brightest of the army were either kicked out for being liberal, Ahmadi, Christian, Shia etc or they were harassed and made to run away.
But the lower cadre was still intact and once they reached higher positions, they repeated the old plan albeit differently.
However the western support for Zia made it very difficult to dispose of him until an infamous incident occurred.
The said incident took the lives of more than a thousand Pakistani's and it alarmed the army as well as the Americans.
Gen Zia ruled out any investigation into the case and fired the Junejo government for opening investigation.
After this Gen Zia went into hiding, he wasn't seen for more than a month when one Lt Gen called him to invite him for some new tank demonstration. Zia was apprehensive but two important American were going to be there so he went along after much coercion.
The performance of the tanks were pathetic so they all decided to go back to their homes in their own planes. One General asked Zia to use a certain plane which he refused, however when he found out that the Americans were going to be in it, he agreed.
Gen Akhtar Rehman was also asked by an infamous Brigadier to take the same plane and he accepted.
They all boarded the plane and suddenly one of the generals who had asked Zia to board the plane got off and said he will follow them in another plane.
But he did send them a few boxes of mango as gifts which were placed in the plane.
The plane flew and it fell, the general in the plane behind them just went home and slept while a Lt Gen stated when told of this incident on the phone something to the effect of:
"What happened is in the best interest of everyone, now don't disturb me"
