 Complete the following phrase:  In October, as Operation Enhance neared completion, the Nixon administration approved another infusion of equipment, Operation Enhance Plus. This served two purposes: to rush war material to South Vietnam before a ceasefire imposed restrictions on military assistance and to reconcile President Thiệu to the fact that the US, without having consulted him, now stood ready to accept a settlement that would permit North Vietnamese troops to remain on South Vietnamese soil, thus legitimizing the results of the Easter Offensive. For the RVNAF Enhance Plus included 19 A1s, 90 A37Bs, 32 C130s, 126 F5s, 177 UH1s, together with the AC119Ks and some other types not yet delivered in Project Enhance. The plan originally called for completing Enhance Plus by 20 November, but later changes moved the deadline to 10 November and added 35 O2 observation craft, already in South Vietnam, as replacements for the older O1s and U17s. The collapse of truce negotiations, which did not resume until after the 