When an engine is ignited, it produces thrust and boosts the rocket into the sky. After the propellant is used up, delay is activated, producing tracking smoke and allowing the rocket a brief coast.
infirmary (plural infirmaries) 1  A place where sick or injured people are cared for, especially a small hospital; sickhouse. 2  A clinic or dispensary within another institution.
A barrack is a building where military personnel live. Itâs usually used in the plural, as barracks. Itâs also a verb â when soldiers lodge in barracks, they barrack there. Now itâs more than a tent. Barracks are the buildings where soldiers, commanders, medical staff, and anyone else affiliated with the military lodge.