Abstract: A first and second attachment system for attachment of a training rig to an upper edge of an ISO shipping container. Both systems include inside corner brackets that fit inside corner fittings of the container. The first attachment system further includes first attachment means with outside corner brackets which are to be attached to the inside corner brackets, second attachment means for attachment to a frame of the container and longitudinal beams for arrangement between the first and second attachment means or two second attachment means. The second attachment system includes a beam with vertical end plates and two outside corner brackets, wherein the end plates and the two outside corner brackets are to be attached to the inside corner brackets. These systems are attachable to any standard ISO shipping container and do not affect the container at all which means that no specially designed container must be used.