The M3A1 was used by cavalry units of the US Army in its intended cavalry role during the North African campaign and the invasion of Sicily, being employed for reconnaissance, screening and as an armored command vehicle. The M3A1 was fast and reliable, making it popular with its crews. It was considered a major disappointment in US Army service, however, primarily due to its poor off-road performance and its lack of overhead protection. Cavalry units were forced to supplement it with M2 Half-Track Car and the larger M3 Half-tracks.