Javelin gaterlin
I believe you mean the "Jericho" missile. That would be Tony Stark.
They changed it because the machine gun fire wouldn't let the troops advance ( charge ). It also changed it because no light Armor ( Jeeps and Motorbikes ) could get past it with out losing a crew member or 2.
it changed by... well it changed... It just changed!
The simple past tense (and also the past participle) is attacked.
the javelin field is 100 metres long but can still be thrown past.
The past tense of change is changed.
A Javelin
It is the Javelin.
The person who uses a javelin or participates in the sport is called a javelin thrower. The javelin throwers throw the javelin by the use of their hands.
The past participle is changed.
* == ==
Changed.
The past participle is changed.
The past tense is changed.
Both forms are "changed"
The word removed is a verb. It is the past tense of remove.