The Reagan administration, which promised to ''hit the ground running,'' has failed to do so in the realm of arms control.
More than a year after the administration took office, the White House has yet to nominate for Senate confirmation two of the four choices put forward by the Arms Control and Disarmament Agency (ACDA) for positions as assistant directors.
Agency head Eugene V. Rostow also ran into White House opposition to his choice to head the ACDA's general advisory committee, William Van Cleave, a California political scientist with a reputation as a hard-liner on arms control issues. And it took the White House months to approve Robert Grey, Rostow's nominee as deputy director. Grey is expected to encounter opposition from Senate conservatives.