It is preferred that the logos be visible when put on a background, but if needed you can put an outline around the logo to add contrast to it. The logos can also be turned into a negative and have a white overlay if desired also (typically done when the background is the same color as the logo).
The Pack, Scouts BSA Boys, and Venture Crew utilize the same logo, which can be found here:
Scouts BSA Girls Logo
Our Scouts BSA Girls Troop has a slightly mirrored version of the logo, and a different primary color than the standard red. It is based on the main 220 logo, but flipped on the Y-Axis and the numbers moved to the right side instead of the left.