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 A–1s, 90 A–37Bs, 32 C–130s, 126 F–5s, 177 UH–1s, together with the AC–119Ks 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 O–2 observation craft, already in South Vietnam, as replacements for the older O–1s and U–17s. The collapse of truce negotiations, which did not resume until after the Christmas Bombing, caused the possible signing of a peace agreement to recede beyond 1 January 1973, and eased the pressure for prompt completion. Reflecting the changing circumstances, the last items in Enhance Plus did not arrive until 10 December.