Problem with the Diffractive Color Waveguide. I'm seeing the Army lay a predicate as the Navy did highlighting the deficiency found in the F-35 Helmet i.e. Contrast, FOV in Daylight and inadequate light security at night (in other words Green Glow 2.0) Pages 101-102

IVAS relies on the successful development and integration of 15 critical technologies. The Army Research, Development & Engineering Command conducted a technology readiness assessment in August 2018, which concluded that all of these critical
technologies were mature or approaching maturity at program initiation. In contrast, OUSD (R&E) concluded in January 2019 that technology risk is high for IVAS and identified the Color Waveguide Display Module as immature. Specifically, it reported the display module did not have the required contrast or field of view for daytime use. In addition, the display module needs reduced light emissions to ensure light security for night operation. While program officials disagreed with the overall conclusion that technology risk is high for IVAS, they are aware of the Color Waveguide Display Module risks and plan mitigation activities.

https://www.gao.gov/assets/710/707359.pdf