* Extending the length. * Learning how to balance the centre of gravity. * Calculating burn length for accurate drop on target. * Maintening the quality of fuel. * Knowing factors that may impact the missile like humidity and tempreture. * Making launch platforms with accurate calculated trajectory settings. * How to fit lighter more powerful batteries to extend the range and duration.... I know I don't know any of the above answers... but he did.
Pro-Hadi forces recapture Yemen's al-Anad military and air base, hundreds of Houthis flee (Reuters)
from the article: 'Hamas weapons capability increased four-fold over last five years'