Just to expand a bit on Joe W's answer:- The Senate usually approves over 30,000 military promotions and appointments alone per year. Passing each nomination individually would eat up a lot of legislative time, so instead a Senator usually asks the Senate that the nominations be confirmed 'en bloc' - i.e. all together. Because this is not technically in order within the Senate rules, unanimous consent is required before this can proceed. One Senator - in this case Senator Tuberville - objecting is enough to force each name to be considered separately. Riddick's Senate Procedure states the following:
A motion to consider nominations on the Calendar en bloc is not in
order; upon objection, the names must be considered separately.
You can see the procedure in action in the Senate section of the Congressional Record for May 10th:
Madam President, I ask unanimous consent that the Senate proceed to the consideration of the following nominations en bloc:
Calendar Nos. 46 through No. 52, No. 82 through No. 107, No. 110
through No. 113, No. 130 through No. 139; that the nominations be
confirmed en bloc, the motions to reconsider be considered made and
laid upon the table with no intervening action or debate; that no
further motions be in order to any of the nominations; that the
President be immediately notified of the Senate’s action.
The PRESIDING OFFICER.
Is there objection?
Madam President, reserving the right.
That is enough to force the nominations to be considered individually, where they can be passed by a standard majority vote. It is the motion to batch the nominations that Tuberville is able to scupper, not the votes on the nominations themselves, as there is no way within the current Senate rules to vote to batch nominations by a simple majority vote.
To get around Tuberville's protest, each nomination needs to be considered one by one, which could take around two hours per nomination based on the Republican's use of the nuclear option in 2019 which shortened the maximum length of debate after a cloture vote on a nomination from thirty hours to two.
Alternatively, Senators could use Senate Rule V to vote to suspend the current Senate rules for a session in which they could pass the nominations en bloc (requiring a two-thirds vote) or change the Senate rules altogether to allow for en bloc votes on nominations. This last approach has been proposed in S.Res.219, which includes the following provision:
It shall be in order for the Majority Leader to move to proceed to the en bloc consideration of not more than 10 covered nominations that were reported to the Senate by the same committee of the Senate and placed on the calendar.