The Combat Engineer (7571) was a 1967 release on a new illustrated card. The helmet that came with this hard to find set is marked Hasbro Hong Kong, instead of the usual Japan. The transit has a small sighting piece that is often missing. There is one minor variation in sets; the top of the yoke that holds the transit (where the pins meet it) can be rounded or squared off
This is a very tough set to find on the card along with the Construction and Demolition sets.