Security You Can Trust
At Delta Sierra Group, we provide tailored security solutions across Long Island, focusing on professionalism and risk reduction.
150+
15
Trusted
Locally
Delta Sierra Group’s team was professional and attentive, making our corporate event feel safe without being intrusive.
M. Cirillo
★★★★★
”Delta Sierra Group delivers exactly what you want in professional security—calm, disciplined, and reliable. Their guards are sharp, respectful, and clearly trained for high-responsibility environments. You immediately feel the difference in professionalism and presence. Highly recommend them for anyone who takes security seriously”
- A. Tsionis
”Every day, they strive to improve their service to the clients by developing the right blend of technology and creativity to make sure every job done is done as efficiently as possible.”
- S. Cassandro