Which series of HMMWV is considered the older version?

The A1 series of the HMMWV represents the earlier version in the evolution of this vehicle. Introduced in the 1980s, the A1 was a significant improvement over its predecessor, but it is still considered an older model compared to the A2 series, which was developed later in the 1990s. The A2 series includes enhanced features, improved performance, and upgraded technology that reflect advancements made since the A1's introduction. Thus, identifying the A1 as the older version is accurate, as it predates the A2 in the timeline of HMMWV development.