Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
The most expensive of these 15 weapons systems is the overhead persistent infrared, or OPIR, space based missile warning systems, which replaces the existing missile tracking system that went into service in the mid-1990s.
Source: https://247wallst.com/special-report/2023/09/05/the-us-militarys-15-future-weapons/