Found these on an end cap at Wal-Mart.
$34.97 each
Although no scale was listed on the box, they looked pretty darn close to 1/18, and looked like a 1/18 figure would fit in the cab of either.
They are yellow, but looked like they could be done in OD green for a SEABEE dio, or a VN Combat Engineer dio.
They were R/C, too, so they might make a good combo with the M113...