The battalion completed their duties but had casualties from two separate sapper attacks at Cu Chi in 1969.

The Battalion completed their duties but had casualties at Lai Khe, on QL-13 and Firebase Thunder III.

However Company C of the 554th was based at Camp Brown at the bottom of the mountain pass about 26 miles from Bao Loc.

[citation needed] The 554th worked to maintain areas of the mountain pass road going to Bao loc.

[citation needed] This article incorporates public domain material from 554th Engineer Battalion Lineage and Honors.