A device to assist performing medical procedures that references anatomical landmarks through adjustable components to identify and stabilize a procedure site and provide guidance in performing the procedure. In one embodiment, an airway creation assist device (ACAD) can be dimensionally adjusted for different patient sizes and properly aligned using anatomical landmarks. The ACAD provides an adjustable template that enables accurate identification of the airway creation site, including but not limited to the cricothyroid membrane. The ACAD uses an insertion guide to guide the obturator and airway tube safely and consistently into the trachea, with a mechanical stop to prevent damaging the posterior trachea wall. The ACAD improves efficacy of the procedure, and makes perforating an incorrect airway creation procedure difficult. In another embodiment, a chest decompression assist device (DAD) Is disclosed for decompression treatment of air and/or fluid in the chest.