The Allied Engineer (Red Alert iPhone) can capture enemy structures, repair bridges and bring Tech structures more financial assistance to their alternated faction.
The Command & Conquer: Red Alert 2/Yuri's Revenge Engineers were non-existent. Since the Soviets have their own Combat Engineer and Yuri's one didn't exist, Allied Engineers were useful at capture and repairing structures or bridges in order for their forces to cross or after enemy attacks. Eva McKenna sent some of these Engineers to recapture an Allied base taken by Soviet forces during their first deployment at Danube River, which finally saw the end of it by destroying Soviet forces and their base in the area. All Engineers were used in other missions usefully without interference of enemy movement and only failed once in a final showdown between Premier Romanov and a famed Allied Commander.
The Engineers for all Allied forces became crucial to the next war effort. Some of them were deployed in capturing a Hospital on Brighton Beach, recapturing Airbases in Cannes and were useful in all Allied missions. The Allies also had the chance of Engineers swimming in water, using first aid tents to heal the wounded and deploying hospitalier camps in their sights for first aid treatment to Allied troops on the battlefield.